根据句意,用方框中所给的词的适当形式填空。

1. She spends lots of time _____housework.

2. Li Lei _____swim in the river last year. Look, he is swimming.

3. His mother is ill at home. He _____look after her very day.

4. Tom's life became difficult after his.father's _____.

5. He_____school last year. He wasn't a student any more.

彩色纤维丝通常是指（）。

A.红蓝纤维

B.红黄纤维

C.蓝绿纤维