一、根据句意及首字母或汉语提示完成句子
1．—How's the weather in your hometown?
—It's very h________ in summer.
2．We need to wear w________ clothes in winter.
3．How many __________(国家) are there in the world?
4．People say that the Sahara Desert(撒哈拉大沙漠) is very ________
(干燥的)．
