If we had taken such effective measures much earlier, the river ________ so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
_____ by the advances in technology, many farmers have set up wind farms on their land.
| A．Being encouraged | B．Encouraging | C．Encouraged | D．Having encouraged |
Don't worry if you don't understand everything, the teacher willthe main points at the end.
| A． | recover | B． | review | C． | require | D． | remember |
It is obvious to the studentsthey should get well prepared for their future.
| A． | as | B． | which | C． | whether | D． | that |
---- Sorry, I have to ______ now. It’s time for class.
---- OK, I’ll call back later.
| A．hang up | B．break up | C．give up | D．hold up |
A persone-mail account is full won't be able to send or receive any e-mails.
| A． | who | B． | whom | C． | whose | D． | whoever |