29．It is required in a recent study suggesting the importance ofteenagers’ communication with other children of the same age.

We find ______ fast and comfortable to travel by plane.

When I was very young, I was terribly frightened of school, but I soon ____ it.

You should try to get a good night’s sleep ______ much work you have to do.[ ]

Chinese students have _________ weeks ______the summer holiday than American students.