I.
1.Could you swim when your were a child?
2.Young people are keen on home robots.
3.We should not throw the rubbish on the street.
4.Da Nang is one of the famous city in Vietnam.
5.We are going on a picnic tomorrow.
II.
1.Although the weather was bad,we still continued the match.
2.Has it rained an hour ago?
3.My brother is good at swimming.
4.If I don't work hard,I won't pass the final exam.
5.Mount Everest is the highest mountain in the world.
6.No mountain in the world is more higher than Mount Everest.
III.
1.Football is the most popular sport in the USA.
2.How do you go to school everyday?
3.We haven't visited Nha Trang before.
4.I am watching Tom and Jerry now.
5.Would like to live in the countryside.