Give the correct forms of the verbs given in brackets.
51. Lan's hair was dirty. Now it is clean, she (clean).…..... it.
52. Many famous paintings in the museum (steal)...... by a thief last night.
53. I think Linda (win)...... the singing competition.
54. How long you-(work)...... for this foreign company?
55. A lot of postcards (send)...... to friends or relatives every year.
56. A portrait of him (take)...... by a famous photographer yesterday.
57. Last summer holiday, we (not visit) ...... many historical places in Ha Noi.
58. Look at the car. The driver (drive) ...... too fast. I think he 59- (hit)......the cyclist.
60. What you (do) ...... at this time tomorrow?