The desk is not dirty.You ________ clean it.
They decided ____________ by bus.
---_______do you have an art festival in your school? ---Once a year.
—Could you tell me __________?—Sorry, I don’t know.
I don’t know if it ________ tomorrow. If it _________ , we won’t go hiking.
-I hear you ________ the USA. When ________ you go there?-Last summer holiday.A. have been to; didB. have gone to; willC. have been to; doD. have gone; did