72. A: Look at the cat! It ............................................... (fall) from the tree. B: Don’t worry! I ........................................ (catch) it.
73. I ..................................... (read) his books when I was at school. I .................................................... (enjoy) them very much.

72. A: Look at the cat! It is falling / is going to fall from the tree.

     B: Don’t worry! I'll catch it.

73. I read his books when I was at school. I enjoyed them very much.