Of all the total number of Chinese people ________ winter sports, the percentage of snowboarders is higher than in any other country.

A．joining     B．taking a part in         C．attending       D．participating in

Scientists believe native Americans arrived by crossing the land bridge connecting ___ more than 10,000 years ago.

A．that’s now Alaska                                      B．which Alaska is now 

C．is now Alaska                                          D．what is now Alaska

_______ I know where I’ll be sent is safe. I shall not worry about it.

A．Even though  B．Unless     C．As long as     D．While

He is only too ready to help others, seldom, ________ making them disappointed when they need help.

A．if never  B．if any     C．if not      D．if ever

Eric _______ to college last autumn. Unfortunately, he missed the entrance examination owing to a car accident.

A．could go B．could have gone      C．must go   D．must have gone

Mr. Li stood by a window inside the room, ________, looking over the square.

A．where I entered        B．which I entered into 

C．which I entered     D．that I entered

________ to the celebration can be a great honor for an ordinary person like him.

A．Invited     B．Inviting    C．Being invited         D．Having been invited

--- The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?

--- ________ my students have a try?

A．Shall        B．Must       C．Will        D．May

Pleasant as they made it ________ , we felt tired after the long journey.

A．to travel         B．travel      C．traveled    D．traveling

--- Alan?              

--- ________? You’ve rung me three times today!

A．What’s yours                                             B．What’s it this time  

C．How about you                                       D．How’s that