ответьте на вопросы
1. what is the laser?
2. what is the function of the laser?
3. what beam of plight does the laser produce?
4. when was the first laser built?
5. what types of quantum generators did scientists develop after 1960?
6. what type of the laser is the most common one at present?
7. where will the laser find the most extensive applications in future

1. Our train starts late in the evening, so if you will come at seven o'clock, we still will have packed our luggage.

2. When you saw him last?

3. I met him when he was walking across the park.

4. Did ou ever act on the stage? — Why, yes, that's what I have done for the last six years.

5. Don't enter the bedroom! The child is  sleeping there, and he always wakes up when somebody opens the door.

6. Where is your luggage? — I left it at the station. I will take it tomorrow when Nick comes to help me.

7. I was reading about an hour when he came.

8. The play hasn't begin yet and the people are talking in the hall.

9. One night a little swallow was flying over the city. His friends few away to Egypt six weeks before, but he stayed behind.

10. What were you doing these three months?

11. Yesterday I bought a new pair of gloves, as I lost the old ones.

12. We are walking in silence. He already told me all that was interesting about himself, and I have nothing to tell him.

13. The moon hasn't rise yet, and only two stars, like two distant lighthouses, were shining in the dark blue sky.

He has read all the Harry Potter books (READ).

She has lost over 6 pounds in the last few months. (LOSE)

This milk doesn’t taste very fresh. (NOT TASTE)

Mum! Come quickly. Tom is hitting me. (HIT)

I have done a lot of homework so far, so don't ask me to do yours. (DO)

This afternoon I am seeing the doctor about my skin problems. (SEE)

Everybody needs money. (NEED)

Computers are becoming more and more popular these days. (BECOME)

This is the first time I have driven a car. (DRIVE)

They normally print the business cards in New York. (PRINT)

The reason I have got a sun tan is that I have just come back form a trip to Cuba. (JUST COME)

Things are really great. Business is booming. (BOOM).

My English has improved since I went to Australia (IMPROVE).

Some people just take movies so seriously. (TAKE)