с заданием. Нужно исправить в предложениях ошибки

Internet - a great invention of our time. Like almost everything in our lives, the Internet can carry and use, and harm. They say there is a lot of anecdotal information.Internet - a boundless expanse of information and communication, which is easily lost. Often, I read something useful and interesting and somehow unnoticed was on unfamiliar advertising site where the last half hour reading the gossip like, "scientists have found something in the depths of the earth" ... or hours to rewrite the social networks with friends rather than to meet and go for a walk.Internet is very useful, because it is a huge database and knowledge where you can find any thing you want - from movies and music, which you are interested, a huge number of books, newspapers and magazines, to simple recipes. It helps in learning. There are some very useful sites, such as where to find information in an understandable form all - events, people, things, events.

1. a. Mrs Smith doesn't spend her weekends gardening.
b. Does Mrs Smith spend her weekends gardening?
2. a. Harry doesn't prefer to travel by air.
b. Does Harry prefer to travel by air?
3. a. I don't do a lot of travelling.
b. Do I do a lot of travelling?
4. a. They don't wish to speak to you.
b. Do they wish to speak to you?
5. a. The children don't like sweets.
b. Do the children like sweets?
6. a. Tom doesn't enjoy driving at night.
b. Does Tom enjoy driving at night?
7. a. They don't sell fresh grape juice here.
b. Do they sell fresh grape juice here?
8. a. My brother doesn't smoke a lot.
b. Does my brother smoke a lot?
9. a. I don't brush my teeth every night.
b. Do I brush my teeth every night?
10. a. The boys don't hurry home after school.
b. Do the boys hurry home after school?
11. a. The taxes don't rise every year.
b. Do the taxes rise every year?
12. a. I don't use a computer in my work.
b. Do I use a computer in my work?
13. a. Mart doesn't work hard at her pronunciation.
b. Does Mart work hard at her pronunciation?
14. a. Betty doesn't go out with someone every Saturday.
b. Does Betty go out with someone every Saturday?
15. a. Nick doesn't  like porriage.
b. Does Nick like porriage?
16. a. My working day doesn't last eight hours.
b. Does my working day last eight hours?