Ⅰ.用关系代词或关系副词填空
1．There is no simple answer, ________ is often the case in science.
2．________ is often the case with children, Amy was better by the time the doctor arrived.
3．Nowadays people are more concerned about the environment ________ they live.
4．The museum will open in the spring with an exhibition and a viewing platform ________ visitors can watch the big glasshouses being built.
5．I will never forget the year ________ my father worked in the factory.
6．The thought of going back home was all ________ kept him happy while he was working abroad.
7．I wish to thank Professor Smith, without ________ help I would never have got this far.
8．It is the third time that she has won the race, ________ has surprised us all.
9．He is such a clever boy ________ we are all fond of.
10．We live in a big house ________ windows face south.
