III. Circle the mistake and then correct it

1. Frank has done(A) his homework and then listened(B) to music.

2. The children have put(A) away their toys but they didnt make(B) their beds yet.

3. Jim learned(A) a lot since he started(B) the language course.

4. Helen has finished(A) her lunch and she went(B) out to play.

5. They havent seen(A) each other since September when they have met(B) at Mary's party.

6. Peter has bought(A) a new MP3 player yesterday but I havent seen(B) it yet.

7. The hockey player hit(A) his head on Friday and he was(B) in hospital since then.