24、----What time do you start work?

---- _____________.

  A. It’s none of your business.        B. It varies.

  C. From 8 a.m. to 4 p.m.                 D. It doesn’t make any difference

23、Jack’s room always has the dusty smell of an apartment whose windows are　opened.

A．rarely                   B．generally             C．apparently           D．frequently

22、－Did you enjoy your journey to the town?

一        ．We had driven more than 3 hours before we found the right way．

A．Absolutely        B．No way          C．Not at all         D．Quite a lot

21、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

20、A good teacher always leaves his students enough time to think and voice their opinions in class，_________ sometimes he may not complete his teaching task．

A．even if        B．in case       C．as long as      D．as if

19、Snowing hard outside， ________ ?

A．doesn't it    B．isn't it        C．does it        D．is it

18、I spent _____________ seemed to be a short period of time learning maths, but I did get somewhere．

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

15、―You see，I'm poor in maths，you are not good at English，and…

―That's _____________ we should help each other．

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