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1.To make sure the driver ( ) him,he rang the bell twice.

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1.To make sure the driver ( ) him,he rang the bell twice.
这里答案是heard,能不能填had heard,为什么?
2.At that time ,bicycle riders were still trying to get used to the new set of wheels on the road.
1.To make sure the driver ( ) him,he rang the bell twice.
1.heard him使别人听见自己说话,不能用had heard,是过去完成时,表示过去的过去收到某人的来信.
2.在那时候,骑自行的人在路上一直在尽力去习惯这种新轮胎.