Choose the right negative form:
They no have been surfing the net all morning.
They have not been surfing the net all morning.

Pete and Mary have not been playing for a long time.
Pete and Mary have no been playing for a long time.

Sally has been not washing her since morning.
Sally has not been washing her since morning.

All around the world there are many natural habitats that are 1) in danger of disappearing. 2) When a habitat becomes endangered, the plants and animals that make their homes there are also endangered. People destroy wild places everywhere. Why? Simply 3) because there are too many of us! We need room for houses, clean water and large areas for building factories. Sounds selfish, doesn't it? It does, but 4) there are ways you can help. Firstly, find out if there are any organisations in your area that try 5) to protect natural natural habitats and get involved. Or, if you really don't have enough time to join one 6) of these organisations, why not donate some money to help them with 7) their cause? Finally, you could write a letter to your mayor or MP protesting that a natural habitat in 8) your area is endangered and needs protection. You can even start a petition, get all your friends and neighbours to sign it and then give it to your local council. Don't forget - we can all do something to help.

1) Tropical...climatesare hot and humid.
2) The heavy snowfall may...prevent..us from going out.
3) Bringing up children is a difficult...task
4) Globalwarming...affects the sea level.
5) That scientists is an...experton fossil fuels.
6) Something has to be done before more animals and plants become..extinct..
7) Cars ..release... fumes and pillute the atmosphere.
8) He promised to come but then he..changed...his mind.
9) We can all ..makea difference to the environment.
10) Gorillas are an...endangeredspecies.