___________he is tired, he can’t work longer.

A. talk

B. talking

C. talker

D. talkative

A. Because of the flooded road, we couldn’t reach the house.

B. If there had been a flood, we couldn’t reach the house.

C. The house have been flooded.

D. The flood prevents us from reaching the house.

A. global

B. local

C. natural

D. dental

A. The winner be chosen by a celebrity panel and home viewers.

B. The winner are chosen a celebrity panel and home viewers.

C. The winner will be chosen by a celebrity panel and home viewers.

D. The winner will be chosen a celebrity panel and home viewers.

A. In 1778, he went to London to study for Benjamin West for four years.

B. In 1778, he went to London study for Benjamin West for four years.

C. In 1778, he went to London study with Benjamin West for four years.

D. In 1778, he went to London to study with Benjamin West for four years.

A. go

B. to go

C. going

D. shall go

A. They are talking about a young pop star now.

B. They talk about a young pop star now.

C. They have been talking about a young pop star now.

D. They will talk about a young pop star now.