This produced a chain reaction, _______ made _______ possible for life to develop.
Faced with the exams, we should work as hard as we can., we shouldn’t do it at the cost of our health.
In the earthquake, parents were willing to dothey couldtheir children.
I admit that there are problems, I don’t agree that they cannot be solved.
With the college entrance examinationnear, both the parents and the students are more and more anxious.
many failures, I have the courage to meet all challenges.