The scientist wrote down_____ series of things to do with______ nature, such as a blue sky.
A a, / B. a, the C. /, / D. /, the
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Do you know why _____ penguins living on _____ South pole are so popular with children?
| A．the; the | B．/ ; the | C．the; / | D． / ; / |
If you plant watermelon seeds in the spring, youfresh watermelon in the fall.
| A． | eat | B． | would eat | C． | have eaten | D． | will be eating |
Playing on a frozen sports field sounds like a lot of fun. Isn't it rather risky,？
| A． | though | B． | also | C． | either | D． | too |
-- According to my grandma, it is a good idea to eat chicken soup when you have a cold.
-- __ , scientists agree with her.
| A．Sooner or later | B． Once in a while |
C．To be exact | D．Believe it or not |
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