—May I smoke here?
—If you ____, choose a seat in the smoking section.
| A．should | B．could | C．may | D．must |
Don’t you think the world would be an easier place to live in, if we all ________ the same language?
| A．speak | B．had spoken | C．spoke | D．would speak |
Knowing ________ you’re good at and doing even more of it creates excellence.
| A．where | B．which | C．what | D．that |
It is a wise father ________ knows his child.
| A．that | B．which | C．what | D．whom |
—May I smoke here?
—Choose a seat in the smoking section, if you ________.
| A．should | B．must | C．can | D．may |
---Would you like to go out for a walk?
----．
| A．No,but I can’t afford the time |
| B．No,I don’t feel in the mood for it now |
| C．You may ask your sister to go,too |
| D．No,thank you |