问题补充：
1. Sandy got a lot of presents at her (nine) birthday party.
2. Something has been done to reduce the price of buildings. People are very happy when ( hear) it.
3. It took me an hour (do) my homework last night.
4. Playing too many computer games is (harm) to you.
5. My shoes are broken. They need(repare).
6. Mr. Black said that he （come）back in five minutes.
7.Look, a young man(lie) on the ground.
8. She is very hungry. She （not eat）anything for three days.ninth
答案：
(答案→)ninth
解析：
【小题1】考查序数词。指第几个生日，用序数词，nine的序数词形式是ninth，故填ninth。【小题2】考查非谓语动词。When hearing在这里相当于when people hear。故填hearing。
【小题3】考查固定句型。It take sb time to do sth做某事花费多少时间。故填to do。
【小题4】考查固定短语。Be harmful to sb=do harm to sb对某人有害，故填harmful。
【小题5】考查固定搭配。Need doing=need to be done需要做某事，主语是物，故填repairing。
【小题6】考查时态。宾语从句的时态与主句一致，主句用的是过去时，从句用相应的过去的时态。根据in five minutes可知，用过去将来时。故填would come。
【小题7】考查时态。根据look可知，用现在进行时，lie的现在分词是lying。故填is lying。
【小题8】考查时态。for three days三天，for加时间段，与现在完成时连用，故填hasn’t eaten。
