My uncle's house in the downtown area is much smaller than ours,but it is twice________expensive.
School children must be taught how to deal with dangerous_________ .
It was foolish of him to _______his note during that important test, and as a result, he got punished.
______hit me suddenly ______ I had forgotten her birthday.
If Joe’s wife won’t go to the party, ________.
It is so cold in Antarctic that the penguins have to stand _______to each other to keep warm.