— Can I pay the bill by check?
— Sorry, sir. But it's the management rules of our hotel that payment ______be made in cash.
| A．can | B．need | C．will | D．shall |
---- Can I sit in the front row?
----Yes, you can take ________ seat you like.
| A．whatever | B．what |
| C．whichever | D．which |
Its hard to ________ the green beans from the red ones, because there are too many of them.
| A．work out | B．watch out |
| C．sort out | D．set out |
Never before _______ seen anybody who can play tennis as well as Robert.
| A．had she | B．she had |
| C．has she | D．she has |
______ her roommates, the girl stepped into the room quietly.
| A．In order to not wake up |
| B．Not in order to be found |
| C．In order not to disturb |
| D．So as to not see |
_________ environmental damage is done, it takes many years for the ecosystem to recover.
| A．Even if | B．If only | C．While | D．Once |