С) заранее )) 1) did you know that george washington had (wood) teeth? 2) the old astronomer patiently made his (observe) and wrote down what he saw. 3) (research) have announced that a major breakthrough has been made. 4) i'm planning to train as a (psychology) when i grow up. 5) that red (build) over there is the science department. 6) the scientist said she had an announcement of international (important 7) science weekly has a special (introduce) offer - the first issue is free! 8) if there are aliens out there, do you think they are much more (technology) advanced than we are?

Wooden
Observation 
Researchers
Psychologist
Building
Importance
Introduction 
Technologically

1) When I rang up my friend, he was sleeping.
2) When my grandfather was watching TV, he fell asleep.
3) When my friend came to see me, I was doing my homework.
4) When I was going to the stadium, I met Kate and Ann.
5) When Nick rang me up yesterday, I was helping my mother.
6) When the children were walking through the wood, they saw a fox.
7) When I came home, my sister was washing the floor.
8) When Mike was playing in the yard, he dound a ball.
9) When I was drawing yesterday, I broke two pencils.
10) When I met Tom, he was going to the shop.
11) When I looked out of the window, the children were playing hide-and-seek.
12) I went to the theatre yesterday.
13) At seven o'clock yesterday I was goin to the theatre.
14) What were you doing at 5 o'clock yesterday? - I was playing the piano.
15) When I came to school, the children were standing near the classroom.
16) We were playing in the yard the whole evening yesterday.
17) When I was preparing breakfast in the morning, I cut my finger.
18) Last year I went to the United States.
19) Did you go to Great Britain last year? - No, I went to France.
20) What did you do yesterday? - I translated a very long article.

When I  rang) up my friend, he was sleeping). 
When grandfather was watching) TV, he fell) asleep.
 When my friend  came) to see me, I was doing) my homework. 
When I was going) to the stadium, I met) Kate and Ann. 
When Nick  rang) me up yesterday, I was helping) mother. 
When the children were walking through the wood, they saw a fox.
 When I came) home, my sister was washing the floor. 
When Mike was playing in the yard, he  found) a ball. 
When I was drawing yesterday, I broke) two pencils. 
When I  met) Tom, he was going) to the shop. 
When I  looked out of the window, the children were playing hide-and-seek. 
I went to the theatre yesterday. 
At seven o'clock yesterday I was going to the theatre. 
What were you  doing) at 5 o'clock yesterday? - I was  playing the piano. 
When I  came) to school, the children were standing) near the classroom. 
We were playing in the yard the whole evening yesterday. 
When I was preparing breakfast in the morning, I cut) my finger. 
Last year I went to the United States. 
Did you  go) to Great Britain last year? - No, I went to France. 
What were you  doing yesterday? — I was translating a very long article.