If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.
| A．chances | B．opportunities | C．questions | D．problems |
I won't go to his party next time. It couldn't have been ________ in fact.
| A．any better | B．any worse | C．so bad | D．the best |
How much of the city have you _________ since you came to work here?
| A．covered | B．gone | C．played | D．been |
-- Did the door-keeper let you in?
-- No. __________ I tried to tell him that I was your cousin, he just didn't believe me.
| A．Regardless of | B．Whether | C．Even if | D．Even though |
Nearly a month had gone by ________ she showed some sign of giving in to her father.
| A．until | B．before | C．since | D．after |
The seller _________ the CD player for $50, but the customer offered $30.
| A．would sell | B．used to sell | C．sold | D．insisted selling |