When the elevator doors open, stand aside and let everyone out ________ you try to get in.
| A．unless | B．although | C．until | D．before |
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—-I’m sorry , but I’m afraid I must be off now.
— ____ , Mr Smith. And have a nice day!
| A．So long | B．So much | C．So well | D．So far |
____ is amazing that such a yo
ung girl can be so good at shooting.
| A．What | B．It | C．This | D．That |
Water, which seems so simple and common, is makes life possible.
| A．what | B．that | C．which | D．how |
Look! That fellow is too sleepy to work. He ______ up reading until midnight.
| A．mustn't stay | B．mustn't have stayed |
| C．ought not to stay | D．should not have stayed |
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