The scientist could hardly find sufficient ground _________ his argument in favor of the new theory.
A. which to base on
B. to base on
C. to be based on
D. on which to base
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First published in 1927, the chart remains an_________ source for researchers.
A. identical
B. inevitable
C. intelligent
D. indispensable
What a fantastic journey! It's worth ____ all my life.
A. remembering
B. being remembered
C. to remember
D. to be remembered
Fill in each of the blanks with one word to complete the following sentences with the help of the initial letter. (在空格处填上适合的单词,完成句子。该词的首字母已经给出)Is there a French word that is the exact e ______ of the English word “home”?
A flight in an aeroplane used to be quite an a ________.