Ⅰ.单词拼写
1．A complex engine has many separate parts, each performing a different ________ (作用)．
2．His car alarm had been going off for two days, and, as a result, the ________ (电池) was flat.
3．It has been ________ (确认) that our school sports meeting will take place next week.
4．When you get into the lift, remember to press this ________ (按钮)．
5．If you need any help, ________ (按) the bell.
