It rained heavily, so we _______ stay at home watching TV or surfing the Internet all day. A. could B. had to C. must
--- What are you doing?---I’m _________ the Internet.
---My dream is to be a teacher.---Really? You must ___________ children, I think.
--- Why are you so ______, Helen?---I thought I had lost my purse, but I didn’t. I found it in my study!
--- Does Mary work carefully?---Yes. I think she works __________ in our class.
---Daddy, shall we go swimming now?---Sorry. It’s not the right __________. I’m too tired.