1.Nobody takes them back to the hotel.

     =>They.......are not taken back to the hotel................................................................................................................

2. They wil have to change the date of the meeting again.

     => The date.........of the meeting will have to be changed again..........................................................................................................

3.Peter doesn’t play football any more.

     => Peter used to........play football....................................................................................................

4. “If i were you, i wouldn’t drive so fast” I said to Nam

     => I advised.......Nam not to drive so fast...........................................................................................................

5. I haven’t heard this song for years.

     => It’s .......years since I last hear this song...................................................................................................................

6. It took two hours to fly from HN to HCM City.

     => It was..........a two-hour flight from HN to HCM ciity.............................................................................................................

7. I like to be a tractor driver better than to be a mechanic.

      => I’d rather..........be a tractor drive to be a mechanic......................................................................................................

8. He is to young to go to school alone.

     => He is.........not old enough to go to school late...............................................................................................................

9. The result of the match was never in doubt.

     =>At no time.......was the result of the match in doubt ........................................................................................................

10. the only reason the party was a success was that a famous film star attended.

     =>Had it...............not been for the famous film star, the party wasn't success ........................................................................................................

a: Xét ΔABC có 

D là trung điểm của AB

E là trung điểm của AC

Do đó: DE là đường trung bình của ΔABC

Suy ra: DE//BC

hay DECB là hình thang

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