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6. It is a long time since he last visited Da Lat.

=> He hasn't.............................................................................................................

7. When did you buy that car?

=> How long...........................................................................................................?

8. This is the first time I have seen such a tall man

=> I have never................................................................................................................

9. Tim hasn't seen his parents for two weeks.

=> The last................................................................................................................

10. It is 5 years since my brother last visited Japan.

=> My brother………………………………………………………………………..