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--Today or tomorrow?

--What are you talking about?

--We are talking about ________ to give a talk on Internet.

In class, ________ should listen to the teacher carefully.

Would you like ________ me an e-mail?

It is going to rain. Don't forget ________ your windows.

I'm glad ________ my father.

What do you usually do ________ the Internet?

Welcome _________ our hometown!

Let's ________ your suitcases to the Internet.

This bike is too small. Give me ________ big one.

It is very dark outside. I ________ stay at home.