Present simple vs. present continuous

Excuse me, (a)   you speak English?

A "Where is Kate?"

B "I (a)   know."

What's funny? Why (a)   you laughing?

Listen! Somebody (a)   singing!

It (a)   raining now. We can't go outside.

I (a)   want to watch this show. Can you change the channel?

A: "Where (a)   you come from?"

B: "Canada."

Steve is a good tennins player, but he (a)   play very often.

A: "Where is Tom?"

B: "He _____________ a shower."

Sandra is tired. She ___________ to go home now.