—She looks very happy. She ______ have passed the exam.
—I guess so. It's not difficult after all.
| A．should | B．could | C．must | D．might |
The lady was so absorbed in her job that she didn't hear a customer ________ at the door.
| A．to knock | B．knocking |
| C．be knocked | D．knocked |
Over 200,000 hotel reservations were made in Hong Kong through Taobao last year, ________ it the most popular travel destination among Chinese netizens.
| A．making | B．to make |
| C．having made | D．made |
According to the new law, the people found ________ “harmful” advertisements on the streets will be punished strictly.
| A．put up | B．to put up |
| C．putting up | D．having put up |
We tried ________ the window, but it was still hot in the room.
| A．to open | B．opening |
| C．open | D．opened |
________ requires us to do two things quickly. First, ________ the main topic; and second, to write down the important details.
| A．To take good notes; recognizing |
| B．Taken good notes; recognizing |
| C．Taking good notes; recognizing |
| D．Taking good notes; to recognize |