16．　　　 We’ll use the sun to _________(加热) our homes.

15．　　　 　Homes will be warm _____(在) winter and ________(凉爽的)in ________(夏天),so they’ll be very _____________(舒适的).

14．　　　 But there will be ________ ____________(坏天气) in spring and ___________(秋天). There will be _________(大)rain and __________(狂) winds.

13．　　　 The summer will ______(是) hot and the winter will ________ (是) warm.

12．　　　 It will _________ ____________(变暖)　at the North Pole so the seas will be very ____________(汹涌).

11．　　　 It will _______(是) hot all __________ (年) so the winter will be very ___________(短).

10．　　　 Everyone will __________(有) a small car.

9．Planes will _____ (是)　very __________ (大的) so flying will be very ___________(便宜的). Fuel will be very _______________(昂贵的).

8．_______ _________ (没有人)will go to school.

7．The teachers won’t ___________(写)on the blackboard _______(用) chalk.