Your return ticket is________for three months.[ ]

Chinese handwriting is an important part of our culture, so young people are required to _____ handwriting.

下列各句中，加点的成语使用恰当的一句是（ ）

His parents, , didn’t look after him very well—the elbows of his jacket and his boots were badly worn out

Linda won’t watch TV unless she ____ her homework in time.