用所给动词的适当形式填空。 1. They _________ (be) to Shanghai twice. 2. ____ your uncle ______ (visit)Beijing before? 3. — Where is your father? — He _______(go) to Jinan. He _____ (come) back in amonth. 4. I enjoy ________ (play) soccer. 5. I ______________ (not cook) before. 6. Lily ________ (have) lunch after12:00 yesterday. 7. I ________ (send) an email to my auntlast week and she ________ (read) it. 8. —How about ________ (enter) the competition? —Good idea! 9. Mr Smith _____________ (not finish)his work yet.