VI
1, At the first days, I found it difficult to understand what he asked me.
2, Australians are English native speakers as they use it as their mother tongue.
3, The early train arrives in London at 10 o’clock.
4, A change in animals’ living pattern causes noise pollution.
5, If the test weren’t too difficult, we could finish it on time.
VII
1, Pig-racing is often held in a country fair for entertainment.
2, English is an official language in many other countries: Malaysia and India.
3, The number of English speakers in the world is increasing fast.
4, Mr. Nam had phoned me before he left Vietnam.
5, He is interested in making the environments clean.
6, They had finished their work before their boss came.
