4.Tom told me that after a few years in China not only____his Chinese, and that he had also obtained more interest.
Despite some difficulties,China has achieved a lot in the past year ______ .
After you have used the dictionary, please put it back ______ it belongs.
A wonderful idea suddenly occurred to me ______ I would turn to the reference book to finish my homework.
Never before ______ so highly successful in his attempts to forecast the weather accurately on a small scale.
There is not much time left, so I won't tell you about it ______ .