1. It's hard to say.

2. as usual

3. at midnight

4. make camp

5. go to sleep

6. can't wait/ can hardly wait to do sth.

7. Take care!

8. be about to do sth. 9. sth. be familiar to sb.

10. sb. be familiar with sth.

11. can't afford to do sth.

12. sleep late

13. make jokes about sb. /play jokes on sb.

14. give sb. directions

15. in high spirits

16. prefer to do sth. rather than do sth. /prefer doing sth. to doing sth.