In ___ year 751, the Chinese traveler Du Huan was taken __ _ prisoner by the Arabic army．
| A．a, the | B．/, the | C．the, a | D．the,/ |
When first ______ to the market, these new products in their company enjoyed a great success.
| A．Introducing | B．introduced | C．to introduce | D．being introduced |
--- Do we have to hand in our research reports this afternoon, Professor Smith?
--- Yes, you _______ . I will be waiting to check them all the afternoon.
| A．should | B．may | C．can | D．must |
The young couple had a quarrel last night and neither of them would give in to ______.
| A．the other | B．another | C．one | D．either |
In the rice-growing world, ______ Chinese scientist, Yuan Longping, is ______ leading figure.
| A．a; the | B．the; a | C．a; a | D．the; the |
You are well prepared for the job interview, ______ there’s no need for you to get so nervous.
| A．or | B．while | C．but | D．so |