1 . The current population of the plant ______________ fit into the state of Taxes, if Taxes were settled as thickly as New York City．

A．could

B．can

C．will

D．should

2 . —My boss is so mean.I should quit my job.
—I_______very seriously about that if I were you.After all it's not easy to get a job these days.

A．will think

B．will have thought

C．would think

D．would have thought

3 . The world today _____ different without the amazing discoveries produced by great scientists.

A．were	B．had been
C．would be	D．would have been

4 . --Tom, your foreign teacher speaks Chinese fluently!
--Oh, she has lived in China for six years; otherwise she        such good Chinese.

A．didn’t speak	B．would not have spoken
C．would not speak	D．hadn’t spoken

5 . It would be very safe if you_________ the door_________ to the garden.

A．fasten; led	B．will fasten; leads
C．fastened; leading	D．fastened; to lead

6 . Sorry, I am too busy now. If I _____ time, I would certainly go for an outing with you.

A．have had

B．had had

C．have

D．had