Hey Chris,… ................ one of your courses has three credit hours?

I have finished the exam. ........................ shall I give it to?

I am booking my tickets for my summer holiday .............. travel agency do you think I should use?

Ben: Have you ever gone swimming in a river? Bob: No, I haven't. I've ...... tried that.

It's very important to have a teacher… .............. knows his subject.

John: excuse me. Is everything ok? Mark: yes, I can’t remember where ....... my car last night.