—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
I______often go fishing when I lived in the countryside.
Oh, Janne, you’ve broken another glass. You ought ____when you washed it.
Without electricity human life_______quite different today.
What would have happened____, as far as the river bank?
—— Will you stay for lunch? —— Sorry, _____. My brother is coming to see me.