The effect of the medicine on this kind of disease remains _____.
| A．seen | B．to be seen | C．seeing | D．to see |
Everyone queued up before the booking office in silence, having nothing to do but _________.
| A．to wait | B．waiting | C．wait | D．waited |
I tried all I could do ______ the topic at the meeting, but failed.
| A．avoid mentioning | B．to avoid mentioning |
| C．avoiding to mention | D．avoiding mentioning |
--The Chinese government is trying to protect the giant panda.
--I know. By 2020, they _________ about 69,500 square miles of land to the country’s nature reserve system.
| A．add | B．are adding |
| C．will add | D．will have added |
Fishing and seafood harvesting has been forbidden along the coast of Galicia, forcing many fishermen ______.
| A．out of order | B．out of touch |
| C．out of sight | D．out of work |
Countries in Southeast Asia have ________ become familiar with Chinese brands, but there is still a long way to go.
| A．actually | B．gradually |
| C．frequently | D．entirely |