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1. She was buying a cake at 3 o'clock yesterday.

Was she buying a cake at 3 o'clock yesterday?

She wasn't buying a cake at 3 o'clock yesterday.

2. They were skiing when it started raining.

Were they skiing when it started raining?

They weren't skiing when it started raining.

3. The dog was sleeping while the cat was eating.

Was the dog sleeping while the cat was eating?/Was the cat eating while the dog was sleeping?

The dog wasn't sleeping while the cat was eating. / The cat wasn't eating while the dog was sleeping.

1.Always put garbage in a garbage bin…;
 2.Don’t hurt animals..;
 3.Recycle newspapers, bottles and metal cans…;
 4.Keep dogs under control…;
 5.Don’t damage trees; 
1.Feed birds in winter…;
2.Plant flowers and trees… ;
3.Keep your litter in a bin…;
4.Don’t spoil the environment…;
 5.Don’t leave litter in the forest… . 

1.Plant but not cut down…;
 2.Recycle bottles and newspapers…;
 3.Keep your city tidy…;
 4.Don’t throw garbage into water…;
 5.Never draw on the trees;
 
1.Don’t pollute rivers with garbage…;
 2.Never ruin birds’ nest…
 3.Resting in the forest  don’t disturb wildlif…;
4.Keep you countryside clean…;
 5.Reduce pollution by recycling.

1. I dont think it is possible to repair this bicycle. It is a waste of time. We'll buy you a new one.
2. We can not climb the mountain with these huge rucksacks. Let's get rid of all the things which are not essential.
3. Life in the country differs from city life. We get up early. You will get used to it, too.
4. This part of the park is for picnics and sports only. It is prohibited to walk dogs here
5. No, it doesnt feel cold at all. We are used to this kind of weather and cold weather is not a reason to stay indoors.
6. Using less packaging is a good way tosave natural resources and reduce pollition.