根据提示填空（每空一词）
Early in the ____ (二十) century, two famous scientists developed their personal ideas about dreams.

Tom, a          boy, can speak English quite well. He wants to learn         language next term.

Please turn to Page        and read the        story.

—Do you know that Mrs. Obama came to China with her mother and two daughters?
—Yes. And it is their        visit to China.

Christmas Day is on        of December.

There are      days in a week and Tuesday is          day of the week.

—There are sixty students in our class. And       of us are boys.—Wow! You have forty girls!

—What’s one fourth and a half? —It’s       .

It is said that the gravity on the Mars is only about       of that on the earth.

I think      of the materials I listened to at the beginning of the exam      easy.