【小题1】 Betty (study) in this school since she came here in 2008?
【小题2】 ---Must the children (teach) how to cook when they are at home alone?
---Of course. It is necessary for them to learn how to cook.
【小题3】I didn’t catch what you said just now because I (answer) a call from my aunt.
【小题4】----Why did John look so unhappy?
----Because he (not reply) to his wife by the time he left for Paris.
【小题5】 Usually before exams, the students (give) five minutes to write their names and read through the paper.
【小题6】Simon (take) a lot of photos while he was in Shanghai. He will show them to us when he returns.
【小题7】The weather report said that the bad weather (last) for two days. What shall we do?
【小题8】Having the robot (do) all the housework is really great. I can get more free time for my hobbies.Has studied
网友回答
(答案→)Has studied
解析：
【小题1】since的主句通常用现在完成时，本题为一般疑问句，助动词has位于句首，后跟动词学习的过去分词studied，故本句空格处填Has studied。
【小题2】本题主句表示的是被动的含义，情态动词must后跟动词原形，被动结构为be+动词过去分词，teach的过去分词为taught，故本句空格处填be taught。
【小题3】本句的原因状语从句为过去进行时，结构为be+现在分词，故本句空格处填was answering。
【小题4】本句的含义为回答语的主句使用的是过去完成时的否定形式，结构为hadn’t+动词的过去分词，故本句空格处填hadn’t replied。
【小题5】本题的主句为被动的含义，使用被动结构be+给的过去分词given，故本句空格处填are given。
【小题6】本题的主句为一般过去时，故本句空格处填动词拍摄的过去式took。
【小题7】本题的宾语从句使用的过去将来时，可用would+动词原形的结构，故本句空格处填would last。
【小题8】have sb do sth表示使某人做某事的含义，故本句空格处填do。