Maybe if I ________ science，and not literature then，I would be able to give you more help.(2011·北京)
| A．studied | B．would study |
| C．had studied | D．was studying |
What I want to know is ______ he likes the gift given by us.
| A．that | B．if | C．whether | D．不填 |
—Waiter!
—
—I can’t eat this. It’s too salty.
| A．Yes, sir? | B．What? | C．All right? | D．Pardon? |
The poet andpianist is going to give us a talk this afternoon.
| A．a | B．the | C．不填 | D．an |
We can never expect ____ bluer sky unless we create _____less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
Would you like tea or coffee?
--_____, thank you. I’ve just had some water.
| A．Either | B．Both | C．Any | D．Neither |