"How beautiful the dress you have just bought is!" Peter said to Mary.

Peter promised to buy Mary a beautiful dress.

Peter said thanks to Mary for her beautiful dress.

Peter complimented Mary on her beautiful dress.

Hình bình hành ABCD,AI vuông góc với BD,CK vuông góc với BD.

a)tứ giác AICK là hình gì?

b)AI cắt CD tại M,CK cắt AB tại N. Chứng minh trung điểm của MN thuộc đường chéo BD

"I'm really sorry for being late again." said Nga.

I felt sorry for Nga's being late again.

Nga was sorry for my being late again.

Nga excused for my being late again.

"If I were you, I'd marry him", she said to me.

She said to me that if I were you, I'd marry him.

She will marry him if she is me.

She suggested to marry him if she were me.

"Remember to pick me up at 5 o'clock tomorrow afternoon." she said.

She told me to remember to pick her up at 5 o'clock tomorrow afternoon.

She reminded me to pick her up at 5 o'clock the following afternoon.

She reminded me to remember to pick her up at 5 o'clock the next afternoon.

"Would you like to go to the cinema with me tonight?" he said to me.

 He invited me to go to the cinema with him that night.

He offered me to go to the cinema with him tonight.

He asked me if I'd like to go to the cinema with him tonight.

You should _ the shoes when coming into the japanese houses

"Please don't tell anyone what happened" An said to me.

An said to me please don't tell anyone what happened.

An told me didn't tell anyone what had happened.

An said me not to tell anyone what happened.

The mother asked her son                    .

Awhere he has been              B. where he had been

C. where has he been            D. where had he been

She asked Peter                        tea or coffee.

A.whether he preferred         B. that he preferred

     John often says he          eating fish.

 He asked           him some money.
A. her to lend  

Mary told me that she                fish the day before.

"Be aware of the dog," said Tom. → Tom warned us              .

A.to be aware of the dog                B. being aware of the dog

 "Please come and join my party tonight" Lan said to her friends

→ Lan invited her friends            

to come and join my party that night

to my party that night

to come and join her party that night

"You should stop smoking and eat more vegetable", said the doctor.

-> The doctor advised him          more vegetable.

A.to stop smoking and eat             B. stop smoking and eat

"I'd like you to tell me the truth," Linda said. → Linda wanted                 her the truth.

"I'll keep it as a secret", Robert said.

→ Robert promised            It as a secret.

Mr. David said, "I played badminton yesterday." → Mr. David said that he         badminton the day before.

Tom                     that his mother was in hospital.

I wondered                     the right thing.

if I am doing                         B. was I doing

The teacher said, "I didn't see her." →  The teacher said                  her.

A.he had seen                       B. I hadn't seen

He asked me when                     there.

A.did I arrive     B. will I arrive      C. I had arrived              D. I can arrive

He said that Ha and his friend               married           .

A.were getting / tomorrow             B. are getting / the next day

C. were getting/ the next day          D. will get/ the day after

 She told me                     her up at six o'clock.

Mai asked Quang                        .

A.when he will come back                 B. when he would come back

C. when he comes back                  D. when he is coming back

Mary said she                     there the day before. 

Ms Nga wanted to know what time                   .

A.the movie began                         B. the movie begins

C. does the movie begin                 D. did the movie begin

The stranger asked me where I                    from.

Nghiệm pt sin2x-cos2x=0

Tập xác định của hàm số y=2cosx-1/sinx

Phương trình Sin2x=cosx có nghiệm là:

Quy đồng mẫu 2 phân thức sau:

$\frac{{\mathrm{x}}^3}{{\mathrm{x}}^3-3{\mathrm{x}}^2\mathrm{y}+3{\mathrm{xy}}^2-{\mathrm{y}}^3}$ ; $\frac{\mathrm{x}}{{\mathrm{y}}^2-\mathrm{xy}}$

Cho hàm số y = -2x^2 + x +2 / 2x + 1 . Mệnh đề nào sau đây đúng :

A. Hàm số không có cực trị 

B. Hàm số có cực tiểu bằng -6

C. Hàm số có cực đại bằng 1

D. Hàm số có cực tiểu bằng -3

Người ta điều chế khí N2 từ phản ứng nhiệt phân muối amoni đicromat theo phương trình (NH4)2Cr2O7 → Cr2O3+ N2+ 4H2O. Biết khi nhiệt phân 32 gam muối thu được 20 gam chất rắn. Hiệu suất của phản ứng này là:

câu này giải bảo toàn khói lượng thê nào ạ