Exercise 1. Fill in the blanks using the correct form of the Adjective:

1. The rubber pipes are of the three materials.

a) flexible b) more flexible c) the most flexible

2. The pressure in the boiler is than it is necessary.

a) little b) less c) the least

3. Mathematics is for technical students that many other subjects.

a) important b) more important c) the most important

4. Metal is than rubber or plastic.

a) strong b) stronger c) the strongest

5. Plastic is material of the three materials: metal and rubber.

a) light b) lighter c) the lightest