—You see, I’m poor in physics and you are not good at chemistry, and…… — That’s _______ we should help each other.A. when B where C. how D. what
About _________of the workers in that steel works are young people.
The workers can complete the new bridge in_________ .
It took me_________days to finish drawing a beautiful horse.
There were_________the students in our class who are from the north.
To plant a tree,we must dig_________ .