—May I smoke here?
—If you ________, choose a seat in the smoking section.
| A．should | B．could | C．may | D．Must |
Catherine bought a postcard of the place she was visiting, addressed __________ to __________ and then posted it at the nearby post office.
| A．it; her | B．it; herself |
| C．herself; her | D．herself; herself |
You may drop in or just give me a call. __________ will do.
| A．Either | B．Each |
| C．Neither | D．All |
Both sides have accused __________ of breaking the contract.
| A．another | B．the other |
| C．neither | D．each |
If you can’t decide which of the two books to borrow, why don’t you take __________? I won’t read them this week.
| A．all | B．any |
| C．either | D．both |
Of all the books on the desk, __________ is of any use for our study.
| A．nothing | B．no one |
| C．neither | D．none |