Don’t make a noise! They _______on a physics problem now.
---How long __________ your parents ___________?---For about twenty years.
--- I hear local people are trying to prevent some businesses building factories here.--- Yes. They say the place ________if some factories ________ in the future.
He told me that he wasn’t used to________by plane and he used to_______ sick a lot.
---What do you want to eat for lunch? 1 will prepare earlier today,---Honey, you____________. Let’s go out to have something different.
---He’s never been to the USA, ?--- . He plans to go there again.