___________ your car unlocked outside means ___________ trouble.
500 yuan can ______ all my monthly expenses.
Tom raised his hands ______ to say something, but he remained silent in the end.
______ from the top of the tower, the south foot of the mountain is a sea of trees.
We tried to find a table for seven, but they were all ______.
The teacher divided the whole class, which consisted ______ 40 students, into four groups.