Unit VII need/have to/be to (revision)

Task 4

Choose between need/have to/shall while filling in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

How to be a friend of the Earth.
There are many simple things we (1) all do to stop the destruction of the environment. First of all, we (2) not dump our rubbish without thinking which things, such as bottles and paper, (3) be recycled. We (4) put objects that we (5) recycle in recycling bins. Secondly, instead of taking our car wherever we go, we (6) to leave it at home whenever possible, and go on foot or by public transport. If there is something wrong with our car’s exhaust pipe, we (7) get it fixed immediately. When we (8) to drive to the supermarket to do our shopping, we (9) always remember to take our own bag, so that we (10) to use the supermarket’s plastic bags.