To save class time, our teachers has _____ students do half of the exercise in class and complete the other half for our homework.
Such plants, particularly___ to collectors, motivated them to explore on a large scale.
Only when he returned home ______ what had happened.
34. He was fortunate ____ he did not get injured in the car accident.
33. He hasn’t decided _____ he will go abroad next year.
The old man turned his business over to his younger son, ________made his elder son discouraged.