V.
1. It comes from all over the country from the gas fields below the North sea.
2. For heating homes, and for cooking.
3. coal gas can be used as a substitute for natural gas
4. It is cheap
VI.
1. Hoa wishes Maryam wouldn't leave viet nam next week
2. If Nam’s English were good, he could participate in the English speaking contest.
3. That festival have been held in August every year
4. I suggest making posters on energy saving
VII.
1. If the picture were beautiful, it would be very famous
2. It is important for us to learn English well
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mình xin ctlhn nha
