He _____ in a university for five years, but now he runs a company of his own.

You have to work very hard in your job, don’t you—-Yes, but I don’t mind that. I _____ hard.

Wetried to find a table for seven，hut they were all.

How long ____ she __ the man— Since last August．

Machines help peole do ___ work with ___ time.