None of us _____ running, but we all like swimming.
| A．likes | B．liked | C．liking | D．would like to |
He is tall, _____ his son is short.
| A．when | B．or | C．while | D．and |
What can we students do _____ the environment?
| A．to protect | B．protected | C．protecting | D．protects |
There are five people in the room, but I know _____.
| A．both of them | B．none of them | C．all of them | D．neither of them |
—What did our geography teacher say?
—She told us that the earth _____ around the sun.
| A．moves | B．moved | C．has moved | D．was moving |