I do enjoy my present job as an engineer.—Well，I would also be anengineer if I my major when Iwas at college.

To be healthy, one must have at least _____sleep every day.

Hi, Bruce! I haven’t seen you for such along time. It _______ that you’ve changed a lot.–Yes, time flies!

you ever any trees last Tree-planting Day — Yes, of course. I have planted six trees since then.

Then you usually lie there just ______ the ceiling, thinking about everything that could go wrong.