4, If you aren't careful, you will fall off your bicycle

6, Mr Tam used to go to work by car, but now he cycles.

7, Traffic rules should be obeyed strictly by the road users.

8, My hair was much shorter than now.

9, I find that learning English is important.

III

1, Did fashionable clothes were used to wear in earlier ages?

2, The report won't be finished until my father comes.

4, I have never come to Paris until the $1^{st}$ September, 2008

5, Sports and games play an very important role in children's life

6, A brochure about Hue Imperial Citadel should be written to prepare for our presentation.

8, Leonardo Da Vinci painted The Mona Lisa in 1503 or 1504 in Italy

10, Both my mother and my aunt are good at cooking

--Những câu bạn làm đúng rồi thì minnhf sẽ không sửa nữa nhé----