6 I'm sure that I lost my watch when we were on the beach.(must) my watch when we were on the beach.
7 It only takes a little time to download a film from this website. (much)
It
time to download a film from this website.
8 I'm really sorry that I copied your work in the exam(should)
your work in the exam
9 It's possible that Tracey lied to us. (may)
to us.
Tracey
10 Every student at school came to the Open Day. (all)
at school went to the Open Day.​

I must have lost my watch when we were on the beach.

It doesn't take much time to download a film from this website.

I shouldn't have copied your work in the exam.

Tracey may have lied to us.

All students came to the Open Day at school.

the floors are being cleaned этажи чистятся

1)the .lily-of-the-valley.. is a beautiful spring flower.

2)there are a lot of..islands. in the pacific ocean.

3)the baikal is the ..deepest. lake in the world.

4)masha spent her holidays on the black sea .coast..

5)moscow is a very ..large. city.

6)the mississippi is a .large.. river, it is the ..largest. river in the usa.

7)the mississippi .flows..south.

8)the urals is a famous .chain.. of mountains.

9)is the volga a .deep.. river.

10)there are four .parts.. in great britan.  they are england,wales,scotland and northern ireland.

11)are there any .plains.. in europe?

12)washington, d.c. lies.. on the potomac river.

13)the forest was .stretching.. to the east.