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: 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 2: Daisy has spent the last two weekends _____ hundreds of photographs so that she can put them in separate albums.

A. playing at

B. sorting out

C. cutting off

D. filling up

Câu 3: Please don’t ______ a word of this to anyone else, it’s highly confidential.

A. speak

B. pass

C. mutter

D. breathe

Câu 4: 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 5: The climate is not dry at all; in fact, they have ____ of water.

A. a redundancy

B. an abundance

C. a deficiency

D. a mixture

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