From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
| A．why | B．how | C．because | D．whether |
That’s the new machine ________ parts are too small to be seen.（）
| A．that | B．which | C．whose | D．What |
Is this research center _____you saw the modern equipment last year?
| A．which | B．that | C．the one where | D．the one that |
The owner of the cinema needed to make a lot of improvements and employ more people to keep it running，________meant spending tens of thousands of pounds.
| A．who | B．that |
| C．as | D．which |
Teenagerstheir health because they play computer games too much.
| A．have damaged | B．are damaging | C．damaged | D．will damage |
I often thought of my childhood, I lived on a farm.
| A．who | B．when | C．where | D．which |