二、单项填空(共15分)21. ---I’m sorry I shouldn’t have laughed at you the day before. --- _________ .
You must place these events in their ________ context.
You can't be careful enough to drive on the ______ road in ________weather.
He always lacks enthusiasm in work,and he's never ________a job for longer than a few weeks.
Spending so much time playing computer games is holding him ________at school.
We thought of selling this old furniture,but we've decided to ________it. It might be valuable.