_____, Carolina couldn’t get the door open.
| A．Try as she might | B．As she might try |
| C．She might as try | D．Might she as try |
In today’s fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is ________.
| A．essential | B．worthwhile | C．challenging | D．sufficient |
—What a pity! Their experiment is a failure.
—They ________ better under more favorable conditions.
| A．should have done | B．could have done | C．must have done | D．may have done |
—Life is hard these days.
—At least we have some money left. That's ________, isn't it?
| A．everything | B．nothing | C．something | D．anything |
Having a glass of water first thing in the morning helps rid your body of poisonous substances that ________ overnight.
| A．were stored | B．had been stored |
| C．are being stored | D．have been stored |
Square dancing ________ to help maintain fitness has caused conflicts between the Damas and the neighboring residents.
| A．claiming | B．claimed | C．having claimed | D．to claim |