单项选择题

When coming across a new word, I usually take the trouble () it up.

A. looking
B. to look
C. and looking
D. to looking

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单项选择题

What is the main idea of this passage().

A. Animals are smarter than we have expected.
B. Aesop’s fables tell real morals.
C. Necessity is the mother of invention.
D. Some of Aesop’s fables may be true.

单项选择题

At that time she had to take care of her husband while () a part-time job in the evening.

A. did
B. does
C. doing
D. do