20．---How long are you staying there?

　　　 --- ______ depends．

A． It　　 　　　　　　　　　　 B．Anything　 　　　　　　　 C．This　 　　　　　　　　　　 D．Everything

19．---I got ______ I am by hard work．

---No, you didn’t．You got ______ with your father’s money．

A．there, where　　 　 B．where, there　　 　 C．there, there　　　 　 D．where, where

18．In my opinion, all Mr White ____ good to his students in his class at present．He is very　 strict in their study．

A．does does does　 　 B．does did do　　　 　 C．does does do 　 　　　 D．did do does

17．Whoever has ________sense knows that smoking is harmful to people’s health．

A．normal　　　　 　 B．general　　　　 　 C．ordinary　　　　 　 D．common