Living in the central Australian desert has its problems, _____ obtaining water is not the least.
| A．of which | B．for what | C．as | D．whose |
—You needn't take an umbrella.It isn't going to rain.
—Well, I don't know.It ________ do.
| A．might | B．need |
| C．would | D．should |
When I was a child, I ________ watch TV whenever I wanted to.
| A．should | B．could |
| C．must | D．need |
I should not have laughed if I ________ you were serious.
| A．thought | B．would think |
| C．had thought | D．have thought |
The door ________ open, no matter how hard she pushed.
| A．shouldn't | B．couldn't |
| C．wouldn't | D．mightn't |
(2013·天津，9)No one ________ be more generous; he has a heart of gold.
| A．could | B．must |
| C．dare | D．need |