Some of these sentences are correct, and some have a word

Some of these sentences are correct, and some have a word which should not be there. If the sentence is correct, put a tick (V ). If it is incorrect, cross the unnecessary have or has out of the sentence and write it in the space. e.g. Susan has lost her keys. She can39;t find them anywhere. Christopher has hurt his hand, but it39;s OK now. has The directors have arrived half an hour ago, but they didn39;t stay long. ____ It39;s raining, and Peter has left his umbrella behind, look. ____ It39;s a long time since your friends have last visited us. ____ None of you have called me for weeks. Aren39;t we friends any more? ____ We can play tennis now. The others have finished. ____ The company has bought some land, but then it sold it. ____ The computer isn39;t on now. Someone has turned it off. ____ Tessa has posted the parcel. It39;s on its way to you. ____ Several bombs have gone off in the city centre. It has happened an hour ago. ____ Simon has left. He and Oliver have left after lunch. ____