They sometimes visit the art gallery. измените во всех формах глагола

1)To control an economy is the same as to intervene in it.
2) TO analyze the labour market, an economist should first explain how people allocate their time to production. 
3)It can be Home Trade when it deals with the customers of a native country and Foreign Trade that is trade between nationS in the form of export and import transactions and capital movements.
4) Each faculty IS headed by a dean and has two forms of academic training : full-day and correspondence.
5)The market mechanism involveS an interaction of priCe, quantity, supply, and demand of resources and products.
В каждом предложении ошибки были.

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.