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

A. managed to

B. can

C. could

Câu 1: Do you have any knowledge …………….how our education system works?

A. of

B. on

C. for

Câu 2: The charity is trying to find ways tosave and ............ the world’sendangered animal species. 

A. the charity is trying to find ways to protect

B. to find ways to protect

C. protect

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

A. best

B. the best

C. the most best

Câu 4: You really should go to Namibia. The scenery is ................. stunning and thepeople are very friendly.

A. very

B. fairly

C. absolutely

Câu 5: Doctors have ….........us to cut downon salt in our diets if we want to reduce the risk of getting heart disease.

A. insisted 

B. suggested

C. advised

Câu 6: I wish that man ....................... tapping hisfingers on the table. It’s reallyannoying me.

A. stopped

B. had stopped 

C. would stop