Exercise1:
1)Many people began to wearing jeans because they were cheap.

=>Because of...cheapness, many people began to wearing jeans....

2)Since he was careless,Tom lost the game.

=>Because of......Tom's carelessness, he lost the game........

3)Although she behaves well,no one loves her.

=>Despite....behaving well , no one loves her

4)Because of the cold weather,the crops are late this year.

=>Because ..the weather is cold......

5)Mary was worried because Tom was late.

=>Because of...Tom's lateness, mary was worried...

6)Tom walked slowly because his leg was bad.

=>Because of...Tom's bad leg, he walked slowly...

7)I came here because I want the English course.

=>Because of...wanting the English course, I came here...

8)I went to school although it was hot

=>Despite..the hot weather, I went to school....

9)Because of the dust in the room,I can't go in.

=>Because there is the dust in the room, I can't go in

10)Because of too much smoke,we have to wear masks.

=>Because......there is too much....

Exercise2:Điền although,in spite of/despite.

1)although the weather was bad,we enjoyed our trip.

2)The children slept well depite the noise.

3)in spite of earning a low salary,Linda gave money to her parents.

4)John rarely sees Paul although they live in the same town.

5)Julie failed the exam in spite of working very hard.

6)although it was cold,she didn't put on her coat.

7)Tom went to work depite not feeling very well.

8)Anna never learned the language although  she lived there for two years.