Pls pls tell adap

Dear student,

2.You can do well in your studies if you work hard.

3.I don't make friends with colleagues until I know them well.

4.By the time he reached home, we had cleaned the house from top to bottom.

5.The first exercise was easy whereas this one is quite different.

6.She's not very smart yet people like her.
7.Since I haven't any money I can't buy anything.
8.Even though he failed he won't give up trying.
9. He fell asleep while he was watching the film.

Regards