The group’s research has done much to our knowledge of the HIV virus.
Jane has been so ______ in getting used to everything that she hasn’t had time for social activities.
As the busiest woman in the village, she made ______ her duty to look after all the other people’s affairs in that village.
To qualify yourself for this kind of new job, I recommend that you ______ some online courses.
The driver started to speed up to ______ for the hour he had lost in the traffic jam.
The plan has to be ______ to meet the real situation.