As a famous public figure, you have a duty to _______ yourself, especially in public places.
| A．focus | B．behave | C．guide | D．Operate |
________ 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? |
—Hi, Mary! Do you know where Jim is?
— I think he ________ a lecture in the library.
| A．will deliver | B．is delivering |
| C．has delivered | D．delivered |