_____ is known to us all is that the 2010 World Expo will take place in Shanghai.

A. It                B. What              C. As               D. Which

I’m sorry you’ve been waiting so long, but it’ll still be some time _____ Brian gets back.

A. before            B. since              C. till               D. after

. There is much chance ______ Bill will recover from his injury in time for the race.

  A. that      B. which    C. until   D. if

I have just received an invitation from a good friend of mine, asking me to pay a visit to ______ we used to study together.

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

It was five o'clock in the afternoon ____they arrived at the hotel.

A. since               B. before              C. that          D. when

The time is not far away ________modern communications will become widespread in China’s vast countryside.

A. as            B. when             C. until              D. before

The telephone rang at midnight, but it stopped ______ I could answer it.

A. when     B. that     C. before     D. since

He liked reading very much. _____ he went, he took a book with him.

  A. Whenever      B. Whichever  C. Wherever   D. However

________ remains a question ________ man’s dream of going to Mars will be realized.

A. That; if                         B. That; whether        C. It; whether           D. It; if

Sport plays an important role in our lives. Some enjoy playing ________others enjoy watching.

A. as                          B. however               C. while                  D. when