_____ in his test papers，he didn’t notice my coming [ ]

I want to walk to Qianmen Street to buy something, _______ I think walking all the way is tiring.

Lisa may be too busy to attend your party but she will try to __________ something out.

Great quantities of soil _________ down the hillside by the rain last night.

There’s someone knocking on the door．Whoit be?—It must be Mary．She promised to be here at 8：00．