In most _____ heavy rains in this area will cause problems.A: areasB: thingsC: casesD:

It was raining when the plane_________ （起飞)in London.

What do you associate ______ such a heavy snow？A: withB: byC: toD: in

Take an umbrella with you _________ it rains.A、in any caseB、in caseC、becauseD、for

More heavy rains______in summer than any other time of the year.A．happenedB．have happenedC

Because the reading _____ in most college courses are very heavy ，students should p

In this densely populated city acid rain is ____