Where was it ______ you _______ our maths teacher?

All the students are cleaning. ________ are cleaning thefloor, and ________ are cleaning the desks.

With an online course Lynn has over 300, 000 students all over China ____ her class through the Internet

5The day breaks, _______ the birds are singing

I cannot thank you ______ much of your kindness I owe my success to you