用括号内所给单词的适当形式填空。
（1）Look! It is raining ________（heavy）. We can’t go out with friends.
（2）It is __________（luck）for us to be born in China.
（3）There is something wrong with my computer. Could I use __________（you）?
（4）He __________（prefer）country music to pop music when he was young.
（5）An __________（invent）is a person who has invented something.