问题描述：
不确定的请说明
1 He has repaired the tap that was found ( ).leak/leaking/leaked
2 The accident ( ) because it was very foggy that evening.did happen/ has happened /happened
3 I was told that the trains ( ) run on Thursday,but they did.did not might/may not/might not
4 I must telephone him before he ( ) away.will go/has gone/goes
5 Ten years ago there was a lot of traffic in britain.Now there is ( ).too much/a lot/much
1 He has repaired the tap that was found ( ).leak/leaking/leaked
2 The accident ( ) because it was very foggy that evening.did happen/ has happened /happened
3 I was told that the trains ( ) run on Thursday,but they did.did not might/may not/might not
4 I must telephone him before he ( ) away.will go/has gone/goes
5 Ten years ago there was a lot of traffic in britain.Now there is ( ).too much/a lot/much
问题解答：
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