—Listen! I heard the birds ______ around us.
—Yeah, what beautiful music!
| A．sang | B．sing | C．to sing | D．singing |
The notice came around two in the afternoon _____ the meeting would be put off.
| A．when | B．whether | C．that | D．how |
Though____ with housework all day long, Julia managed to spare some time to learn Chinese
| A．occupying | B．occupied | C．being occupied | D．occupy |
Maria has written two novels, both of _________ have been made into television series.
| A．them | B．that | C．what | D．which |
That is the only way we can imagine _________ the overuse of water in students’ bathrooms.
| A．reducing | B．reduced | C．to reduce | D．reduce |
The doctor recommended he ____ a few more days in hospital.
| A．stays | B．to stay | C．stay | D．would stay |