It is global warming, rather than other factors, _______ the extreme weather. A that have led to B which has caused C which are causing D that has led to
—Has Billy finished his homework today?—I have no idea.He it this morning.
These wild flowers are so special I would do _______ I can to save them.
Parents are taught to understand _______ important education is to their children’s future.
We cannot figure out _______ quite a number of insects, birds, and animals are dying out.
Is this the reason _______ at the meeting for his carelessness in his work?