He always has a lot of _______ ideas in his mind, and sometimes we do not even know what he is thinking about.
A. fickle
B. abnormal
C. weird
D. errant
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In order to write his paper, he borrowed a lot of _______ books from the school library.
A. sample
B. reference
C. resource
D. assist
When he caught a _______ of his girl-friend in the rain, Jack asked the taxi driver to stop to pick her up.
A. glance
B. peep
C. glare
D. glimpse
This nation is noted for its economic _______.
A. steady
B. stability
C. static
D. stationary
It may be necessary to stop ________ in the learning process and go back to the difficult points in the lessons.
A. at large
B. at intervals
C. at random
D. at length