While he has failed again and again, he never gives up in order to _____his dream. [ ]

It’s a good idea. But who’s going to_____ the plan? —–I think Tom and Grey will.

It may be 5 or 10 years __________ it is possible forpeople to find a space station on the moon.

I’m _____ in collecting stamps at all.

Have you _____? — No. I had the wrong number.