Circle the correct answer a or b

My sister's son is a student. he studies well at school. he doesn't get bad marks, as a rule. my sister usually helps him to do lessons. i haven't got a sister, but i have four brothers. two of them finished studying at university last year, and another two of them studying at school. this young woman is a engeneer. she works at a big factory. she has a lots work. every morning she takes her little son to kindergarden. klimov is an old worker. he hasn't grandson, but he has two granddaughters. one of them was born seven years ago, and another one was born last year.

1)    Some people saw a UFO in the sky above London last night.

A UFO in the sky above London was seen by some people last night.

2)    They reported it to the police.

The police was reported about it.

3)    The army sent a helicopter to look at it more closely.

A helicopter was sent by the army to look at it more closely.

4)    The UFO shot the helicopter down and killed both men in it.

The helicopter was shot down by the UFO and both men in the helicopter were killed.

5)    People have given photographs of the UFO to the police.

The police have been given some photographs of the UFO by the people.

6)    Experts are looking at them now.

They are looking by experts now.