3.What is the average depth of the
lake?
a) 500 metres
b) 400 metres
c) 300 metres​

average depth 0.8-1 m, maximum - 2.5 m.

1)now my friend lives in moscow

2)as a rule, he spends his holidays at the seaside.

3)i am very busy on sunday.

4)he often helps me when i need his help.

5)she is very glad to see me. 

6) здесь кажется что-то пропущено

don't smoke, don't  drink, do sports,  lead an active life, skiing, swimming,  temper,  not to play the  computer, eat right, go to the walk