33.As soon as I came to the party, people had gone home.
34. It's unsafe to visit this country during summer vacation.
35. The number of people learning English increased dramatically.
36. After Phong had worked hard for a week, he went to the beach.
37. I have never heard about the tram system in HaNoi before.
38. It took two hours for the firefighters release the driver from the wreckage.
39. The president was taken to the hospital for an emergency operation.
40. After I had saved my document the computer crashed.
( chúc bn học tốt )
