It’s easy ___ because the bicycle needs ___space.

I called you yesterday evening, but therewas no answer.–Oh, I’m sorry I __________in the shoppingmall.

I like to go shopping with you, ________I’m too busy now.

______ you’ve got a chance, you might as well make full use of it.

b is with _______ hours: one can work in the morning or in the afternoon, so long as work for no less than five hours every day.