So absorbed ________ in the research that she didn’t hear someone knocking at the door.
At present an increasing number of parents wish to _________ changes in educating their children due to dissatisfaction with the educational system.
To get a good view of the scenery in China, Lucy would spend a lot of time on the train _________ travel by air.
The sports meeting of our school all of us had looked forward to _________ in _________ fine weather, which was beyond our expectation.
_________ himself with confidence, the young man went to the manager’s office bravely.
— It is reported that America offered to help us build aircraft carriers. — But many citizens would rather our country __________ one by ourselves.