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

She never ______________________________________, so I don’t believe that she will come to the party as she said.