When the boss got to the factory ________ midnight, he found it ________ ruins.
As a graducate in computer science, he ___ to work out the problem.
I don't think ___ possible to master a foreign language without much memory work.
If you want to borrow a football after school, your student card ___ here.
You ___ me, but since you have,I’ll keep it secret from others.
If you have something important to do, you ___ waste any time.