[单选题] All _____not gold that glitters.

1、[单选题].--" Would you mind the window? It's hot here!" May said.
--"__________."Tom replied.

• A、to open ; No, please
• B、open ; Yes, please
• C、opening; No, of course not
• D、opening ; Yes, please

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2、[单选题]I don't think we have met before.
--Yes, once at a party, but we___________.

• A、weren't introduced
• B、didn't introduce
• C、haven't introduced
• D、were not introducing

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3、[单选题]Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.

• A、since
• B、before
• C、after
• D、when

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4、[单选题]Nearly________ of the surface of our planet is covered by water.

• A、seven-ten
• B、seven-tenth
• C、seven-tenths
• D、seventh-ten

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5、[单选题]The reason_________ he didn't come was _________ he had to take care of his sick mother.

• A、why ; that
• B、why ; which
• C、which ; why
• D、that ; for

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