Составить вопросы к готовым предложениям. напоминаю тема present perfect. 1)they have bought a new computer for their son. 2)she has been to the alps. 3) my cousin has given me this disc. who?

1. To get a constant current, you must have its source. 2. A pyrometer is used to measure the temperature of hot metals. 3. Man learned to dissolve atoms in order to receive a large amount of energy. 4. Scientists are trying to solve the problem associated with new phenomena of electricity. 5. Lightning rod-metal device for protecting buildings from lightning. 6. Carrying out experiments with atmospheric electricity was very dangerous at that time. 7. To magnetize an object is to place it in a magnet field.

1 . a) The girl (writing) on the blackboard is our best pupil. b) Everything ( written) here is quite right. It

2. a) The house (surrounded) by tall trees is very beautiful.

b) The wall (surrounding) the house was very high.

3. a) Who is that boy (doing) his homework at that table?

b) The exercises (done) by the pupils were easy.

4. a) The girl (washing) the floor is my sister.

b) The floor (washed) by Helen looked very clean.

5. a) We listened to the girls (singing) Rus­sian folk songs.

b) We listened to the Russian folk songs (sung) by the girls.

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