Complete the sentences with the correct form of can, could, may, might, should and ought to. 1. We swim right after having a big meal. It's a bad idea.
2. I carry these bags for you?
3. You ...enter this area. It's forbidden.
4. ...I have some more fruit salad, Mum?
5. Children ...listen to their parents.
6. The sky is cloudy. It rain later.
7. You use my computer if you want.​​

Newton's great work is called "Principia" was published in 1687. More than a century ago the Russian chemical society was organazied and named after Mendeleev. The subjects in the first and second years of the students studies are very important for their future specialities. The government wasn't interested in the invention which popov made ( was made by Popov).

1) We were told about the film which was made several years before. A very interesting article which is published in the magazine is available in our library. The instrument is made of the new material. We don't know much about this subject. We heard so much about the cosmonauts who came to our town. Have you seen the new device's main components it consists of? 

I was at my grandmother's country-house in July.I didn't stay at home and went to the forest almost every day.I saw differen trees,bushes,animals and insects.One day I saw a beautiful butterfly.It was flying from one flower to another.Its wings were so beautiful that I couldn't tear myself away from them.I wanted to catch it.But the butterfly seemed to be magic.I couldn't catch it.Next day I returned to the same place where I saw my butterfly.And I couldn't beleive my eyes.Two beautiful butterflies were flying!I have never seen such wonderful and big butterflies!