Had they known what was coming next, they second thoughts.
| A．may have | B．could have |
| C．must have had | D．might have had |
He ________ the beautiful painting without hearing me.
| A．stared at | B．glared at | C．glanced at | D．watch out |
To make members of a team perform better, the trainer first of all has to know their _____ and weaknesses.
| A．strengths | B．benefits | C．techniques | D．values |
—Thank you very much for helping me out of trouble, Bob.
—________.
| A．With pleasure | B．My pleasure | C．That's right | D．I hope so |
Cheer up! It won’t be ______ we can meet again.
| A．before long | B．long before |
| C．after long | D．long since |
______ the ancient Egyptians built the pyramids puzzled people for centuries.
| A．Whether | B．What | C．How | D．Where |