Câu hỏi: The computer allows us to work fast and _______.

A. efficiently

B. differently

C. variously

D. freshly

Câu 1: He was determined to give his family a secure and solid _______.

A. base

B. floor

C. basement

D. ground

Câu 2: Some researchers have just _______ a survey of young people's points of view on contractual marriage.

A. sent

B. directed

C. managed

D. conducted

Câu 3: I put your keys in the drawer _______ they cannot get lost.

A. because

B. let alone

C. instead of

D. so that

Câu 4: You should not burn _______. You had better dig a hole and bury it.

A. dishes

B. lab

C. garbage

D. shift

Câu 5: It is not easy to ________ our beauty when we get older and older.

A. develop

B. maintain

C. gain

D. collect

Câu 6: It's hard work looking _______ three children all day.

A. after

B. up

C. to

D. through