Insert the verb to be (to) or to have (to) in the necessary tense form.

1. I wondered what ... to happen to us. 2. It looks like raining. You ... to take your raincoats. 3. We agreed that the one who came first ... to reserve seats for the rest of us. 4. Nobody met me at the airfield as I ... to have arrived a day later and could not warn any of my friends of the change. 5. He always puts off doing what he ... to do until it ... to be done. 6. We ... to leave on Monday, but because of a two days' delay with the visas we ... to book tickets for Wednesday. 7. There is nothing strange in what he did. It ... to be expected. 8. It was too late to change the plan, and it ... to remain as it was. 9. You ... not to tell him about it if you don't want to. 10. You ... not to tell him anything about it before you get further instructions. 11. They hoped to spend the summer together, but that ... not to be. 12. ... I to do it all by myself? 13. When no food ... to be had he seemed capable of doing without.