“Have you ever been to HK, Jim?”—– “ Yes , I ______ there for two weeks with my parents last summer.”

It is dangerous _______ the children _______ play near the deep water.[ ]

If it _____ this Saturday, we will _____ for a picnic. [ ]

did they go to work last week Once .[ ]

Are these your books? — No, they aren’t. They are ____________.