You stepped into the lab with your shoes on? You’re _______ to take them off before you enter it.
Everyone has periods in their lives __________ everything seems very hard.
The result was far beyond _____we had expected, ____brought great joy to every one of us.
—What do you think of the blind man?—I’ve never seen a man with sense of touch.
一Isn't it a surprise that I happened to meet Francis Mathews at the Christmas party last week?一If my memory serves me correctly, you _____ each other for exactly two years.
We’d better set off,or it will be dark we know it.