Cho: 1: crômatit2: sợi cơ bản 3: ADN xoắn kép  4: sợi nhiễm sắc 5: vùng xếp cuộn6: NST kì giữa 7: nuclêôxôm Trong cấu trúc siêu hiển vi của NST nhân thực thì trình tự nào sau đây là đúng?
A.3-2-4-1-5-6
B.3-2-7-4-5-1-6
C.3-7-4-2-5-1-6
D.3-7-2-4-5-1-6

Choose the best answer to complete the sentence.
The librarian asked us………………so much noise.
A.not making
B.no making
C.don’t make
D.not to make

Ở người, bộ phận nào nằm giữa trụ não và đại não?
A.Não trung gian.
B.Tiểu não.
C.Tủy sống.
D.Hạch thần kinh.

Choose the best answer to complete the sentence.
You can’t go to England without………………to Buckingham Palace.
A.go
B.to go
C.being gone
D.going

Choose the best answer to complete the sentence.
Please stop………………me questions!
A.to asking
B.ask
C.to ask
D.asking

Choose the best answer to complete the sentence.
I apologized………………the book at home.
A.to leaving
B.leaving
C.to leave
D.for leaving

Choose the best answer to complete the sentence.
I have already finished all my work, so I don’t have………………tonight. I think I will read for a while.
A.studied
B.studying
C.to study
D.study

Choose the best answer to complete the sentence.
"May I help you?” – “Yes, I need someone………………the tire on my car.”
A.changing
B.change
C.to be changed
D.to change

Choose the best answer to complete the sentence.
"Fred is going to work as an ambassador, isn’t he?"  - “Yes, he was lucky………………such a good job.”
A.to be giving
B.to give
C.about getting
D.to be given

Choose the best answer to complete the sentence.
Many northerners look forward………………a garden in the spring.
A.to planting of
B.to planting
C.to plant
D.with planting