16.The bomb was being carried to a safe place when it is explored.

G.

1.Nam has learnt English for two years.

2.They began working in that factory five years ago.

3.My father hasn'r smoked for two years.

4.I haven't written to him for two years.

5.Helen has studied French since 1995.

6.I wish my neighbor didn't make a lot of noise at night.

7.Our teeth should be brushed carefully after meals.

8.He wishes he didn't late.

9.Why don't we use electricity e conomically.

10.The boy wishes he was a doctor.

IV.

5.with

6.of

7.with/about

8.from

9.in

10.away

1. Nam has started learning ....for two years.

2.they began work...five years ago

3.My father has stopped....for two years.

4.helen has studied Frech since 1995

       tra lại động từ cột 3studied