—We all had a lot of fun at the barbecue yesterday. Pity you weren't there.
—I really should have gone with you but I________on some remaining problems.

—Don't use my handkerchief to wipe the table，gentleman.
—Oh, I' m very sorry.I________clearly.

—What's that terrible noise?
—The neighbors ________ for a party.

When I met him the other day，it was the first time we ________ each other since we were at school.

The country life he was used to________greatly since 2002.

—What a mistake!
—Yes. I ________ his doing it another way, but without
　success.

—Have you known Dr. Jackson for a long time?
—Yes，since she ________ the Chinese  Society.  

Progress ________ so far very good and  we are sure that the work will be finished on time.

—Why don't you go home?
—Because a lot of work________yet.

I'll return the book to the library as soon as I________it.