. Supply the correct form of verbs in the brackets.

1.- How long (it take) . . . . . . . .. . . . . . . . . . . . . . . . . .  your father (paint) . . . . .. . . . . . . .  this picture?

   -  Oh, quite a long time. And he used only three colors on it, you see.

2. Her younger sister (enjoy / play) . . . .. . . . . . . . . . . . . .  with kittens very much.

3. Do you think (take) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  photos costs much money?

4. Nam says he (come) . . . . . . . . . . ….  . . . . . . back to his home village to work after he (graduate) . . . . . ……... . . . .