1. I went to the box office at lunch time, but they ____had already sent_________________ (already / sell) all the tickets. 2. They told me they (not, eat) _______had not eaten_______________ such kind of food before. 3. I _______took___ (take) the book back to the library when I ______was reading____ (read) it. 4. The house was very quiet when I _____got_____ (get) home. Everybody ___had gone______ (go) out for dinner. 5. After she ______had filled____ (fill) the basket, she ___went_______ (go) to the check out. 6. Yesterday morning I ____remembered______ (remember) the answer to the question Bob _____had asked_____ (ask) me the night before, so I _____phoned_____ (phone) him. 7. Angela asked me how to use the photocopier. She _____had never used________________ (never / use) it before, so she ____didn't know______ (not / know) what to do. 8. Two days ago I ___met_____ (meet) an old friend who I _____hadn't seen__________ (not see) for years. 9. By the time we _____arrived______ (arrive) at the hall, the lecturer ______had made__ (make) half of his speech. 10.Before he _______moved__ (move) to London last week, Peter __had lived_______( live) in Paris for more than 10 years. IV. VERB FORM 1. I‟m looking forward _______to meeting___ her again (meet) 2. The teacher requested us ___to do______ all the exercises in the book . (do) 3. A radio is used ______to listen_____to the news and music . (listen) 4. A computer can help us ____design_______houses , bridges and schools (design) 5. Would you like _____to go_______ out with me tonight? (go) GIẢI THÍCH TẠI SAO RA ĐƯỢC ĐÁP.Mn giúp e bài này với ạ.