用短语的适当形式填空（共5小题；每小题1分，满分5分）

小题1:The country has __________ __________ (经历) too many wars, making her people suffer a lot.

小题2:They are trying to __________ __________ __________ (利用) energy from the sun and wind to save resources.

小题3:Wang Wei is a careless person, for she doesn’t __________ __________ (关心) details.

小题4:I tried to get Jane to join us tonight, but she wouldn’t __________ __________ __________ (改变主意). She prefers to stay at home in the evening.

小题5:There have been __________ __________ _________ (一系列) car accidents at the crossing.

我国实行按劳分配的物质基础是：

A．生产资料公有制

B．生产力发展水平

C．人们劳动的性质和特点

D．商品经济的发展