Question

1.In 1675,nobody..................(know) about electricity.

2.Televisions and radios.............(not/exist) then either.

3.Luckily for us,inventors...............already............(make) a lot of clever things.

4......................your baby teeth ...............(fall) out yet ? 5.Mine...............(fall) out a long time ago.

6.Two hundred year ago people..............(steal) ivory from walruses! 7.They....................(make) false teeth out of the ivory. 8.Somebody...............just...................(discover) a way of drilling teeth with a laser.It's great ! It's doesn't hurt.

9.When I was younger I ..........................(hate) going to the dentist. 10.I..................just...............(go) to the dentist and he said my teeth were perfect.

Answer 1

1. knew

2. didn't exist

3. have.....made

4. Have...fallen

5. fell

6.stole

7.made

8. has...discovered

9. hated

10.have...gone

Answer 2

1.In 1675,nobody  KNEW (know) about electricity.

2.Televisions and radios DIDN'T EXIST (not/exist) then either.

3.Luckily for us,inventors HAVE already MADE (make) a lot of clever things.

4HAVE your baby teeth FALLEN(fall) out yet ? 5.Mine FELL(fall) out a long time ago.

6.Two hundred year ago people STOLE(steal) ivory from walruses! 7.They MADE(make) false teeth out of the ivory. 8.Somebody HAS just DISCOVERED discover) a way of drilling teeth with a laser.It's great ! It's doesn't hurt.

9.When I was younger I  HATED (hate) going to the dentist. 10.I HAVE just GONE (go) to the dentist and he said my teeth were perfect.