用所给词的适当形式填空
（1）It’s________（cloud）today．It seems that it is going to rain．
（2）Lisa is my________（old）sister and she is two years older than me．
（3）Please explain the matter________（clear）．
（4）We need to learn how to dress________（proper）．
（5）The telephone is an important invention．It is a popular way of________（communicate）．
（6）I don’t see any________（relate）between the two problems．
（7）Firstly，I don’t have enough money．________（second），I don’t have free time．