Recently, there have been many occasions ______ you have attended events on your own.
Could you show me the TV set you’d like ________?
Now an increasing number of middle school students go abroad for further study at their own ________, trying hard to realize their dreams.
Darwin counted 225 flowering plants, ________ he collected and brought home 193.
When somewhat better ________ academically, he returned home to continue his research.
This new teaching approach is specially ______ to develop children’s problem-solving skills.