Ex.1 Translate the sentences. Define the type of conditionals.

а) 1. If a solid body or a liquid is heated, it will usually expand.

2. The measurements were always correct provided the necessary instruments were used.

б) 1. Providing mercury did not expand when heated, it would not be used for taking temperatures.

2. But for electricity little could be done in a modern research laboratory.

в) 1. Provided the operator's cabin had been equipped with electronic control, he would have been able to work faster and with greater precision.

2. The manned spaceships might not have been launched into the cosmos unless scientists had studied the information received from the space satellites.