Câu hỏi: At times, this can be risky, and the keepers have been injured and one has been killed.

A. good

B. useful

C. healthy

D. secure

Câu 1: Be quiet or you'll wake the whole house!

A. still

B. noisy

C. peaceful

D. tranquil

Câu 2: She had a cozy little apartment in Boston.

A. uncomfortable

B. dirty

C. lazy

D. warm

Câu 3: I love it when someone's laughter is funnier than the joke.

A. cry

B. shout

C. smile

D. frown

Câu 4: Use water sparingly and keep water clean.

A. dusty

B. dirty

C. wicked

D. halfway

Câu 5: Some couples see single women as a threat to their relationships.

A. married

B. lonely

C. divorced

D. alone

Câu 6: It is easy to open a shop but hard to keep it always open.

A. welcome

B. appear

C. switch

D. close