8) My rule is to be looking for / not to

8) My rule is to be looking for / not to look for trouble.
9). Let him introduce / to introduce himself first.
10) The delegation is due to have arrived / to arrive tomorrow.
11) The old pensioner could not afford to pay / pay the bill.
12) It is hard to imagine but this old woman in the picture used to be / being young
and beautiful once.
13) The weather is expected to settle / to have settled by the weekend.
14) I demand to tell / to be told the truth.