The number of the students in our grade _______about six ______, ______ of them are girls.

I didn’t know when he _____ back. He said he would call me when he _____ home.

May I speak to Mr. Smith?— He __________. Can I ______ a message?

All my friends came to my birthday party. That _______me very happy.

I _______ these mistakes down in my notebook next time.