is mentioned above，the number of the students in senior high schools is increasing.
| A．Which | B．As | C．That | D．It |
That is the only way we can imaginethe overuse of water in students' bathrooms.
| A． | reducing | B． | to reduce | C． | reduced | D． | reduce |
（北京卷28）. It took me a long time before I was able to fully appreciate what they __ for me.
| A．had done | B．did | C．would do | D．were doing |
（北京卷26）. --I'm sorry, but I don't quite follow you. Did you say you wanted to return on September 20?
--Sorry, I myself clear. We want to return on October 20.
| A．hadn't made | B．wouldn't make | C．don't make | D．haven't made |
.（北京卷24）. --I'm not finished with my dinner yet.
--But our friends for us.
| A．will wait | B．wait | C．have waited | D．are waiting |
（北京卷22）. In the spoken English of some areas in the US, the "r" sounds at the end of the words .
| A．are dropped | B．drop | C．are being dropped | D．have dropped |