The scientist________ the behavior of the mice after they were given the drug.
All this was used to ______ what percentage of time people spent in an unpleasant state.
The exciting news that Mo Yan won the 2012 Nobel Prize for literature renewed people’s enthusiasm towards literature, which is a great ________ to the development of Chinese literature.
Due to the unreasonable individual income ______, the gap between the rich and poor has become an outstanding issue.
________ your present bad mood, you’d better put off the work till next week, when you may be in higher spirits.
The virus came without people’s being aware of it and it was ________ assumed to be a common one. But with more cases reported, it proved wrong.