用所给动词的正确形式填空1 What _____you ____when your mother called you up(do)
2 Why____(not,tell)him about that thing
3 I often find someone ____(practise)in the park
4I've warned Jack ___(not,swim)here
5I__(be)to Canada twice .It's so beautiful
6Our head teacher saw the empty seat next to me and asked where jeff _____(go)