Could I have_______?()

I hear that you are ______ collecting stamps. Could I have a look？A: interested inB: ple

I don’t know where the key is, but I suppose I ____________it at home.A. could have left

I regret （not accept) ______ your advice. Otherwise, I could have succeeded.

If only I ________ more money, I could buy the new house.A. hadB. haveC. have hadD. had

I wondered if she could have the opportunity to spend______here so that she could learn mo

I have not found my book yet; in fact, I am sure _____ I could have done with it.A.w