Our family _____ always _____ love and understanding.

　 A. was rich; on 　 B. is rich; in

　 C. is riching; in 　 D. riched; by

1.    Though great progress has been made in astronomy in the past fifty years, ______ still much that remains mysterious to astronomers _______ the universe, even the solar system.

A. It is; of　 　　　　 B. there is; about　 　 C. It is; with 　　　　D. there is; with

—Where have you been all day?

   —I _______ some former classmates and I couldn’t get back until it was dark.

A. have met　　　　 B. met　　　 　C. would meet　 　D. had met

— I doubt that the guard will allow you to enter.

— I’m going in _________.

A. without his permitting     B. although he says other

C. no matter what he says     D. despite his saying it

—Did you go somewhere on holiday?

—I ____ to go to Hawaii, but I didn’t sign up for the tour in time.

A. would hope　　 B. was hoped　　 C. had hoped　 D. have hoped

The doctor did everything he could so that he _________ save the soldier's life.
A. might　　　 B. must 　　　　C. had to 　　　　 D. was able to　

In the meantime, the question facing business is whether such research is ____ the costs. 
A. worth     B. worth of     C. worthy     D. worthwhile

I 　　　　along the street looking for a place to park when the accident 　　　　.

　 A．went; was occurring　　　　 B．went; occurred

　 C．was going; occurred　　　　 D．was going; has occurred

Paul doesn’t have to be made_______. He always works hard.

A. learn　　 B. to learn　　 C. learned　　　 D. learning

The driver is________(负责) for the passengers’ safety.