Water, which seems so simple and common, is ______ makes life possible.
| A．which | B．what | C．that | D．how |
Jason will never forget about his 18th birthday, saw his being admitted to Harvard.
| A．when | B．which | C．that | D．it |
The manager is trying to find a man to recommend how the job .
| A．is done | B．be done | C．should done | D．to do |
What is the best way you can imagine the overuse of water in our school?
| A．reducing | B．to reduce | C．reduced | D．reduce |
— When shall we restart our business?
— Not until we our plan.
| A．will finish | B．are finishing |
| C．are to finish | D．have finished |
The why he is absent today is he has got a bad headache.
| A．reason; that | B．reason; because |
| C．cause; that | D．cause; because |