What is even more important is______ the earth cooled down, water began to appear on its surface.
| A．that | B．that as | C．which | D．which as |
It was dark. We decided to___________for the night at a farm house.
| A．put away | B．put down | C．put up | D．put on |
. I have taught hundreds of students,___________ having been working in their fields for years.
| A．some of whom | B．some of them | C．most of whom | D．who |
______, he still cannot make himself understood.
| A．So clearly he speaks English | B．So clearly does he speak English |
| C．Clearly as he speaks English | D．As he speaks English clearly |
_________ is unknown to us all.
| A．Where did he get it | B．Where he got it | C．That where he got | D．Which he got it |
The village has developed a lot ______ we learned farming two years ago.
| A．when | B．which | C．that | D．where |