Sorry I’m so late, but you cannot imagine _______ great trouble I took to find your house.
| A．what | B．how | C．which | D．why |
—Did you return Fred’s call?
—I didn’t need to ____ I’ll see him tomorrow.
| A．though | B．unless |
| C．when | D．because |
__ unemployment and crime are high, it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
| A．Although | B．As long as | C．If only | D．As soon as |
hungry I am, I never seem to be able to finish off this loaf of bread.
| A． | Whatever | B． | Whenever | C． | Wherever | D． | However |
____ caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |