20、The company provides cheap Internet access．_______, it makes shareware freely available.

A．In addition          B．In brief         C．In return           D．In common

19、We went to Mountain Tai last weekend, ________, not surprisingly, was crowded with visitors.

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

18、I used to go camping a lot, so it won’t be the first time I          in a tent.

A．have slept          B．had slept　          C．was sleeping           D．slept

17、______ I enjoy the book with some nice pictures, I don’t have enough money to buy it．

A．Since             B．While               C．As          D．If

16、The       of surfing the Internet is how you can tell whether the information is true or not.

A．ability          B．competition          C．challenge            D．knowledge

15、With the effects of global warming, trees         their leaves much later in the year.

A．are losing           B．have lost             C．lost            D．were losing

14、The government has          plenty of food and clothes of high quality to the people in Wenchuan.

A．suffered         B．arranged          C．adjusted            D．supplied

13、What China can learn from          2008 financial storm has become          hot topic among us.

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

12、To her disappointment, what she had devoted herself to _______ in nothing but failure.

A．resulting             B．results           C．has resulted          D．resulted

11、Although he was in poor health, Robert succeeded          other more famous engineers failed．

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