The new iphone 5 costs so________that I don’t think a student can________ it.

Could you help me change the wheel，sir?—______，madam，which one?

It’s ______ exciting thing for ______eight-year-old girl to find _______ UFO.

Ten years ago the population of our village was _________ that of theirs.

Only when _____ possible to settle the problem how to get the machine repaired.