Activity 1

1 WRITING.   Correct the mistakes.

• If cars  won’t use gas, they will use alternative sources of energy.
• Cars won’t polluted the environment if they use solar power or natural gas.
• If cars of the future use water as fuel, people save a lot of money on gas.
• People will buy these new cars if they be inexpensive.
• If scientists invent flying vehicles, there won’t are any more traffic jams.