He made a promise____he would achieve the success that his parents were looking forward to

We laugh at jokes, but seldom _____about how they work. [ ]

The little girl sat at the door with her legs ___ andkept her eyes ___at the planes flying in the sky.

－Why does theriver smell terrible－Because largequantities of water______

While the dog, you should take care not to Otherwise, it may be dangerous to strangers.