Only when you stay with ____ local people for a period of time will you have ____ better understanding of life there.
| A．a; a | B．the; a | C．the; the | D．a; the |
—May I smoke here?
—Choose a seat in the smoking section, if you ________.
| A．should | B．must | C．can | D．may |
________ unusual, this is not the first time the government has chosen to take control of large companies.
| A．Since | B．When | C．Because | D．While |
People work through problems in ways ________ they are unaware.
| A．of which | B．in which |
| C．on which | D．to which |
________ Sunny Tours, I’d like to welcome you all to my city.
| A．On behalf of | B．On account of |
| C．In honor of | D．In hope of |
—I’m sorry, but we can’t find your purse in our restaurant.
—________ I seem to lose something every time I eat out.
| A．How come? | B．Come on! |
| C．Bad luck! | D．Pardon me? |