一、填空
1.Leave him _____ peace!
2.What has left him _____ for so long?
3.Did you have _____ bother finding the house?
4.What _____ bother! We've missed the bus.
5.What are you shooting your gun _____?
6.Have you been fighting _____ your brother again?
7.I visited a number of research i_____ in Asia.
8.Even if you plant the seed upside down, the r_____ will still grow down.
9.There's no simple s_____ to the problem of pollution.
10.We need to call for a g_____ ban on whaling.
