14. Tổng hợp 12 thì

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In all the world, there (be) ____ only 14 mountains that (reach) ______ above 8,000 meters.

He sometimes (come) _______ to see his parents.

When I (come) ______, she (leave) _____ for Dalat ten minutes ago.

My grandfather (never, fly) ______ in an airplane, and he has no intention of ever doing so.

We just (decide) ______ that we would undertake the job.

I knew that this road (be) _____ too narrow.

Right now I (attend) ______ class. Yesterday at this time I (attend) ________ class.

Tomorrow I'm going to leave for home. When I (arrive) ______ at the airport, Mary (wait) will have waited for me already.

Margaret was born in 1950. By last year, she (live) ______ on this Earth for 55 years.