Câu hỏi: When you write your essays you ............. copy ideas from books without referencing them properly.

A. mustn’t

B. don’t have to.

C. have to

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: ………… people live in the countrysidethan 100 years ago.

A. Less

B. Few

C. Fewer

Câu 3: 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 4: Do you have any knowledge …………….how our education system works?

A. of

B. on

C. for

Câu 5: I know it’s not much of a present but I made it .............

A. me

B. myself

C. by myself

Câu 6: 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