I can’t finish the work _____ your help.[ ]

Enough sleep is good for teenagers. — Quite right. If you for your favorite TV programs, you will feel sleepy.

He _____ a song last night.

I found a story-book on the desk, it isn’t mine, it is ___,I think.

Last night I called him. ______ 8:30, but he was not in. [ ]