I unexpectedly met an old friend yesterday. In fact, we hadn't seen each other for years.

A. make societies develop

B. invent writing

C. continue to exist

D. pass this knowledge down

A. those

B. that

C. this

D. there

A. but

B. a few

C. to buy

D. expensive

A. that

B. so

C. too

D. such

A. for

B. while

C. in

D. during

A. In spite of busying at work, my father takes good care of his children.

B. Despite being busy at work, my father takes good care of his children.

C. My father takes good care of his children but he is very busy at work.

D. Although my father is very busy at work, but he takes good care of his children.

A. If my English were good enough, I could participate in the competition.

B. If my English is good enough, I can participate in the competition.

C. I could participate in the competition because my English was good.

D. If my English weren't good enough, I couldn't participate in the competition.