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

A. of

B. on

C. for

Câu 1: 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 2: What ........... in order to get a permitto work in your country?

A. do I need to do

B. must I do

C. ought I do 

Câu 3: A recent government report has warnedthat ...................... we act immediately to reduce pollution, there will be serious consequences, for the planet.

A. provided that 

B. in case

C. unless

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: I wish that man ....................... tapping hisfingers on the table. It’s reallyannoying me.

A. stopped

B. had stopped 

C. would stop 

Câu 6: Scientists finally ............... find a curefor the disease after years of research.

A. managed to

B. can

C. could