Many a time ________ swimming alone.
| A．the boy went | B．went the boy | C．did the boy go | D．did go the boy |
– Amazing! You _____ have won the first prize in the national English speech contest!
– I’m lucky that all my efforts have finally paid off.
| A．must | B．may | C．can | D．should |
A qualified doctor has to constantly update his knowledge in order to maintain his professional _____.
| A．conscience | B．competence | C．conservation | D．convenience |
We all consider _____ significant that we should cancel the order immediately.
| A．how | B．which | C．this | D．it |
_____, everyone present was amused by his adventure story in Africa.
| A．Absurd as might it sound | B．As it might sound absurd |
| C．As absurd it might sound | D．Absurd as it might sound |
_____ they are fit, I see no reason why they shouldn't go on playing basketball for another four or five years.
| A．In case | B．Provided that | C．Unless | D．As if |