______ without friends ______ the most difficult challenge for Chuck while living on the island.
| A．How to survive, is | B．How does he survive, are |
| C．How does he survive, is | D．How to survive, are |
单项选择（每题1分）
My computer is _____ in need of repair because it doesn’t work at all.
| A．well | B．very | C．badly | D．rather |
单项选择（每题1分）
—Tomorrow is Christmas!
—_____? We have no holiday anyway.
| A．What if | B．So what | C．Why | D．Really |
单项选择（每题1分）
We must think twice _____ we make the final decision.
| A．when | B．while | C．until | D．before |
单项选择（每题1分）
The stones each _____ as much as two tons.
| A．weighs | B．are weighed | C．weigh | D．is weighed |
单项选择（每题1分）
Is this the reason _____ she explained in the report for her success in the job?
| A．what | B．that | C．how | D．why |