Now we could not do anything but ______ forhim here.

Peter is so ___ that he won’t change his mind; we’d better give up the idea.

In which word does the letter ‘a’ have a different（不同的） sound

Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner

That accident totally _________ our arrangement and caused a lot of problems, which we found difficult to _________.