—Who is the man ______ by a group of students there?—A professor _____ research on physics.
All the neighbor admire this family _________the parents are treating their child like a friend.
___ well prepared you are , you still need a lot of luck in mountain climbing.
We’ll have a picnic in the park this Sunday _____ it rains or it’s very cold.
—Did you return Fred’s call? —I didn’t need to ____ I’ll see him tomorrow.
__ unemployment and crime are high, it can be assumed that the latter is due to the former.