Ответ:

1) I can't run fast. It's _too_ hot.

2) I'd like to buy this dress, but it's _too_ expensive.

3) Jack can't do this exercise because it's _too_ difficult.

4) I'm sorry, but the results of your test aren't good _enough_.

5) The book wasn't interesting _enough_ to read.

6) The film was _too_ boring to watch so we left the cinema early.

7) The meat is _too_ cold to eat. Shall we heat it on the stove?

8) We don’t get _enough_ sleep because we have _too_ much homework to do.

9) I don't wear this hat in winter. It isn't warm _enough_

10) She's _too_ young to go to discos.