Badhabits,formed,aredifficult,

Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.

A．before

B．once

C．until

D．unless

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The discussion_______________alive when an interesting topic was brought in.

A． was coming

B．had come

C． has come

D． came

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My mind wasn’t on what he was saying so I’m afraid I________________half of it.

A． was missing

B． had missed

C． will miss

D． missed

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All the preparations for the task ___________, and we’re ready to start.

A． completed	B．complete
C．had been completed	D．have been completed

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Visitors ________not to touch the exhibits.

A． will request

B．are requested

C．are requesting

D．request

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I hope there are enough glasse for each guest to have ________.

A．it

B．those

C．them

D．one

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