---It’s time for class.
---Let’s         .
A.begin   B.begining  C.beginning

---I often chat with my friends on the Internet.
---You are so smart! Will you please tell me ________?

---Would you mind ______ next to you?     --- ____________.

If people ________ cutting down the forest, they will have nowhere _______.

Why not________your teacher for help when you can’t finish ________it by yourself?

Mr Smith’s watch doesn’t work, so he’s going to ask someone _______it．

A park is the best place ______ kites. I often go there at weekends.

Remember       off the lights when you leave the classroom.

I made faces _________the baby ________crying.

We are not supposed ______ basketball on Sundays.