Câu hỏi: A _____ is a tube through which a person swimming just under the surface of the sea can breathe.

A. maneuver

B. photograph

C. volume

D. snorkel

Câu 1: His work ______ new ground in the treatment of cancer. It is now giving many cancer victims hope of complete recovery.

A. broke

B. found

C. dug

D. uncovered

Câu 2: The world’s biodiversity is declining at an unprecedented rate, which makes wildlife ________.

A. prosperous

B. vulnerable 

C. prefect

D. remained

Câu 3: Many young people in rural areas don't want to spend their lives on the farm like ______ parents.

A. weather-beaten

B. up-to-date

C. long-term

D. wide-range

Câu 4: I’m not going to go ice skating! I’d only fall over and __________ a fool of myself.

A. create

B. show

C. do

D. make

Câu 5: I was very sad when the vet said he’d have to _____ Gertie, our lapdog.

A. put down

B. fell up to

C. pull through

D. wear off

Câu 6: We were quite impressed by the ______ students who came up with the answer to our question almost instantly.

A. absent-minded

B. big-headed

C. quick-witted

D. bad-tempered