Scientists have found evidence ________ global warming caused the world's first horses to become smaller nearly 50 million years ago.
| A．what | B．that |
| C．which | D．whether |
We would have gone fishing yesterday, but it _______ heavily.
| A．rained | B．had rained | C．has rained | D．would rain |
The guidelines are _______ in the second paragraph.
| A．heard out | B．set out | C．lived out | D．pointed out |
Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.
| A．must go through | B．may go through |
| C．must have gone through | D．could have gone through |
Written in a hurry, __________________ .
| A．they found many mistakes in the report | B．he made lots of mistakes in the report |
| C．there are a lot of mistakes in the report | D．the report is full of mistakes |
Is it the country ________ you studied ________ you are going to visit next week?
| A．in which; which | B．where; that | C．that; that | D．where; where |