Câu hỏi: She got a terrible mark in the exam so she ........ very hard at all.

A. mustn’t have worked

B. can’t have worked

C. didn’t work

Câu 1: If I didn’t have to work tonight, .................

A. I’d be able to relax now.

B. I’m able to relax now.

C. I’ll be able to relax now. 

Câu 2: Learning a foreign language is important because it helps you to understand othercultures better. …………. it can be auseful skill in many areas of work.

A. However

B. Despite this

C. In addition

Câu 3: This factory produces some of .............. cameras in the world.

A. best

B. the best

C. the most best

Câu 4: Many children these days do not have ahealthy diet................ is possible thatthis is because less healthy foods are cheaper than healthy ones. 

A. What

B. That

C. It

Câu 5: Scientists finally ............... find a curefor the disease after years of research.

A. managed to

B. can

C. could

Câu 6: Do you have any knowledge …………….how our education system works?

A. of

B. on

C. for