A hearty laugh relieves physical tension, ________ your muscles relaxed for over half an hour.
A．to leave B．left
C．leaving D．leave
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
