选择并抄写单词
Before you join the company, you will have to have a ________(medical; medicine)examination．
There was a grin ________(in; on)his face．
We can change the electricity into forms of energy ________(that; what)we can see, hear or feel．
Nobody's ever seen electricity．It's ________(invisible; visible)．
A meter measure the amount you use, and you get a bill for it ________(monthly; month)．
Tom thinks we can buy the electricity ________(in; with)packets, like sweets!
History books are ________(fiction; non-fiction)ones．
You must switch ________(on; off)the electricity before changing．
The cables are connected to a ________(reservoir; shop)．
Electricity ________(comes; flows)through a wire．