Mr Liu is ____ unusual teacher. He has written _____ useful book for his students.
They don’t know what ___________ the problem .
Don’t try to do everything at once. Take it a bit _______________.
We __________ obey the traffic rules.
What a ________ rain ! It has rained ______ since last night.
—Andy finished first in the competition! --- Really ? Sounds ________ to believe.