1£®There are still many problems to_be_solved (solve) before we are ready for a long stay on the moon.

2£®He made a promise to_come (come) here on time tomorrow.

3£®We're to hold a meeting in half an hour.The decision to_be_made (make) at the meeting will influence the future of our company.

4£®You don't have to run fast or for long to_see (see) the benefit.

5£®To_make (make) it easier to get in touch with us£¬you'd better keep this card at hand.

6£®Many airlines now allow passengers to print their boarding passes online to_save (save) their valuable time.