a lot of people needed medical help, I decided to be a volunteer worker.

A．Know          B．Known           C．Knowing         D．To know

The government announced that six highways      by the end of last year.

A．built                B．had built                  C．have been built               D．had been built

Sorry I’m so late, but you cannot imagine       great trouble I took to find your house.

A．what         B．how          C．which             D．why

It was after careful consideration        we decided to take action.

A．which           B．that         C．why           D．when

---I regret to say that I      have shouted at you the other day.

---Forget it. I was a bit out of control myself.

A．shouldn’t            B．mustn’t           C．couldn’t                D．mightn’t

---If you       to my birthday party last Saturday, you would have met our old friend Jim .

---Oh, what a pity!

A．came               B．had come                C．would come                   D．would have come

---Why were you absent yesterday?

---I caught a cold,      I had been walking around in the rain.

A．but          B．so         C．and           D．for

When I couldn’t avoid meeting him, I faced an embarrassing situation       I could only keep silent.

A．who         B．which          C．when         D．where

As we know,     Potala Palace, a combination of Tibetan construction art and culture, is considered         precious treasure of China.

A．a; a          B．the; a            C．the; the           D．a; the

Once made out, the plan must be carried out         any difficulty.

A．regardless of          B．instead of           C．because of          D．in need of