根据句意，用所给动词的适当形式填空。
Unit 3 ________ (consist) of 8 lessons three years ago.
In the past few years, she _______(write) three popular books.
The old computer _______(break) down easily, so I had to restart it again and again.
He likes playing the guitar _________ (have) fun when he has spare time.
The Great Wall as well as the Palace Museum _________ (attract) lots of tourists from abroad every year.