I ________ be slow, but at least I don't make stupid mistakes.

A．must             B．need              C．should            D．may   

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

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

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

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

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

______ 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

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

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

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

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

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

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

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

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