Đất phù sa của vùng Đồng bằng sông Hồng chủ yếu do sông nào bồi đắp?

A.Sông Đồng Nai

B.Sông Chảy

C.Sông Cửu Long

D.Sông Hồng

Thể thơ tác giả dùng để viết nam quốc sơn hà là gì

1.  If he really doesn’t feel like ------------ now, I suggested that he should go out for some fresh air.
A. work B. to work C. worked D. working

Find out one mistake in each of the following sentences.
1. It was very selfishness of him to offer us his room.
A. Was B. selfishness C. to offer D. room
2. We were delighted by the wonderful embarrassment of the local people.
A. Were B. the C. embarrassment D. local people

Fill in the blank with the correct form of the word in the bracket
1. There is a lack of greed and __________ (self)
2. The public _______ with the miners’ strike. (sympathy)
3. Our ( sympathy) ______ are with the families of the victims.
4. Senator Capp is very __________ to environmental issues.
5. I felt (embarrass) _______ about how untidy the house was.
6. Jane often asks a lot of ( embarrass) ___embarrassing___ questions.
7. My folks are (celebrate) _____ their 50th anniversary.
8. There were the New Year lively ________________in the city central.
9. He talked ( constancy)________ about his new work.
10. He kept in _________ contact with his family while he was in Australia.

Phân tích đa thức thành nhân tử :

a) 2x^2 - 2xy

b) x^2 - y^2 + 2021x + 2021y

trong bảng tuần hoàn các nguyên tố hóa học sô chukyf nhỏ và chu kỳ lớn là