1b every day

2d all are correct

3d a and b are correct

4b should find a good solution

X.1 although the weather is fine thu is still bringing a raincoat with her

2 when did you last watch an action movie ?

3 if we try to recycle things we will save natural resources

4 even though it is raining hard we still want to go to school

5 Nam suggest that Minh should stop eating chicken to avoid being infected with bird flu

6 john used to smoke a lot a year ago

7  my father has given up smoking for one year

8 they started working in that factory in 2001

9 I didn't see her along time ago