Everyonedohisbesttomaketheworl

Everyone _____ do his best to make the world safe and clean.

A．can　　

B．may　　

C．should　

D．hadto

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---You ____ him more help, even though you were very busy.
---Well, now I regret not.

A．might have given	B．may give
C．must have given	D．should give

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---The last one _______ pays the meal.
---Agreed!

A．arrived

B．arrives

C．to arrive

D．arriving

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Where to get the materials and how to get them ________ at the meeting.

A．have not discussed	B．have not been discussed
C．has not discussed	D．has not been discussed

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Hurry up, _______ you will miss the early bus.

A．otherwise

B．if

C．and

D．but

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---Shall we meet at 6:00 or 7:00?
---________.

A．Any time is OK	B．At any time
C．Yes, at 6:00	D．Well, either time will do

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