I)
$1-D$
$2-A$
$3-B$
$4-F$
$5-C$
$6-E$
II)
1) Yes, it is
2) It is slow and easy
3) Because people never throw their rubbish on the roads
4) It means "the people"
5) It's that there is not much to do in the evening
IV)
1) If you practice speaking English everyday, you will improve your English
2) My brother used to smoke a lot when he was a student
3) An interesting movie was watched by me yesterday evening
4) Our uncle always drives carefully
