1. The plane take off at 8:30 a.m. has been delayed because of the thick fog.

2. University students can have various kinds of part-time jobs such as flyers (传单), working as private tutors or delivering newspapers.

3. The speech is scheduled at 3 o'clock this afternoon. The students are the assembly hall now.

4. They their children the virtue（美德） of always telling the truth.

5. He is a child. He should be allowed to make his own decision.