.Water and air are _______ to human beings. We can not live without them.
A.harbour B.function C.definite D.essential
选择D，意思是水和空气对人类来说都是必不可少的，我们离开他们无法生存。essential就是必不可少的意思
----Let’s go to the West Hill Park by taxi.---- Oh, it is not far away from here. We _______take a taxi.A. couldn’t B. mustn’t C. needn’t D. can’t
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If it rains tomorrow, we _________ to picnic.A、wouldn't go toB、can't goC、won't go
If it rains tomorrow, we () for a picnic.A. wouldn't go outB. can't go outC. won't go out
If it rains tomorrow, we()out for a picnic.A. wouldn't goB. can't goC. won't go
We ______ booked. Look, this restaurant is almost empty.A. must haveB. can’t haveC. should haveD. needn’t have
The collision bulkhead shall be of ______.A.water-tightB.air-tightC.fire-tightD.oil-tight
If it rains tomorrow, we ______ for a picniC. 一般现在时A. wouldn’t go outB. can’t go outC. won’t go out (will not)
