Ⅰ.用所给词的适当形式填空
1．What he needs is the __________ (secure) of a happy home.
2．The doctor is performing an important __________ (operate) on the injured child.
3．He was driven out of his homeland for __________(politics) reasons.
4．The pinetrees have been planted in a very wide __________(distribute)．
5．Please help me to draw off these __________ (mud) boots.
6．We have made all the __________ (arrange) for the conference.
答案：1.security 2.operation 3.political 4.distribution
5．muddy 6.arrangements
