1. When the waiter finally (arrive) arrived with the food, the guests (already leave) had already left
  the restaurant.
2. I cannot see Mr. Khoa . He (just park)  has just parked               in front of the supermarket.
3. The Smiths (spend) had spent                two days in Hanoi before they (travel)    travelled          to Sa Pa last week.
4. His bicycle wasn’t there   because someone (take)     had taken             it without asking him.
5. My brother (not call)  hasn't called                       us since he (move)     moved          to Ho Chi Minh City last month.
6. Why had your father (lock)        locked                    all the windows before he went to bed?
7. Tom (break) broke his leg after he (fall)  had           fallen off through the rock.
8. Nam (not know)   didn't know            who the man was. He (not see)   had not seen                 him before in his life.
9. Oh! You (paint)      has painted                        the kitchen. I like the colour.
10. My uncle (visit)    had visited                            over 20 countries by the time he was 30 years old.