下列各句中，没有语病的一句是（2分）

It’s helpful to put children in a situation _____they can see themselves differently. [ ]

arents encourage their children totake an active part in social events, ______ those events do not interfere withtheir studies

I am shocked at the news that many pupils were killed in the terrible traffic accident. — So am I. Little ____ the safety of the poor children.

Miss Green has ______ free time than Mr Green. She is busy all day.