1. You _____________ not yawn (
=gapen) in public; it's very rude!
2. Peter is very smart; he ________ speak more than 4 languages.
3. _________ you pass me the salt, please?
4. I think you ________ bring an umbrella, in case it starts to rain.
5. I ______ not forget to bring my book this time. I really need it.