Some of these sentences are correct

Some of these sentences are correct (write CORRECT) and some have a word that should not be there - write it down
1. The directors have arrived half an hour ago. But they didn't stay long.

Câu trả lời của bạn
2. It is raining and Peter has left his umbrella behind, look.

Câu trả lời của bạn
3. It's a long time since your friends have last visited us.

Câu trả lời của bạn
4. None of you have called me for weeks. Aren't we friends any more?

Câu trả lời của bạn
5. We can play tennis now. The others have finished.

Câu trả lời của bạn
6. The company has bought some land, but then it sold it.

Câu trả lời của bạn
7. The TV isn't on now. Someone has turned it off.

Câu trả lời của bạn
8. Tessa has posted the parcel. It's on the way to you.

Câu trả lời của bạn
9. Several bombs have gone off in the city centre. It has happened an hour ago.

Câu trả lời của bạn
10. Simon has left. He and Oliver have left after lunch.