Complete the sentences with one of the idioms in the correct form:

1. keep a secret,
2. keep a straight face,
3. put in time,
4. put on an act,
5. put right,
6. keep in touch,
7. keep one's chin up,
8. put the cart before the horse,
9. keep one's word,
10.keep one's head

I think that my friend is ______________________________________to talk about remodeling the house before he buys it.