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Mr. Pike _______ English at our school for 20 years before he retired last year.
Jane _______ her homework when her friend asked her to do his as well.
The students _______ the topic when the bell rang.
Từ 2 âm tiết
I'll call you as soon as I _______ in Paris.
When Carol _______ last night, I _______ my favorite show on television.
By the time the software _______ on sale next month, the company _______ $2 million on developing it.
A. went - had spent B. will go - has spent
D. goes - will have spent
We _______ in silence when he suddenly _______ me to help him.
When the first child was born, they _______ for three years.
Mike _______ his favorite program on TV when the lights went out.
Quyen _______ in the supermarket when she saw her old friend.
When I got home I found that water _______ down the kitchen walls.
When we enter the room, our boss _______ for us here.
When I _______ her, I _______ her your regards.
When he _______ us to go in, we _______ outside the exam room for over half an hour.
I haven’t met him again since we _______ school ten years ago.
Paul noticed a job advertisement while he _______ along the street.
The children _______ to bed before their parents came home from work.
6x÷3+3x+1-18≤2x+1Giải phương trình này giúp với ạ
Tính đạo hàm cấp 2 của các hàm só sau a) 1x2-3x+1b) y=xlogxc) y=x2e
cho 20ml rượu etylic 46độ tác dụng hết với na thì V ở đktc thu đc là ( klg riêng của rượu là 0,8g/ml và của nước là 1g/ml )
Tìm x biết: 52x+1÷1252=56
Tính: x12 - x22