It is uncertain side effect the medicine will bring about, although about two thousand patients have taken it．
| A．that | B．what | C．how | D．whether |
.More than one girl _____, as we expect.
| A．has come | B．had come | C．came | D．have come |
As we all know, two thirds of the earth’s surface is water, ___ a lot of fish.
| A．provided | B．providing | C．which provides | D．it provides |
Jack is the ______- child in the family; he wants to have a brother.
| A．one | B．single | C．only | D．separate |
Only in this way, directed by the teacher, ______work out the problem the day before.
| A．had they | B．they could | C．could they | D．did they |
He went swimming on a hot day, ________.
| A．only to be drowned | B．so as to be drowned |
| C．in order to be drowned | D．so that he could be drowned |