Mary is flying to France soon. She will arrive ______ London _____ the morning of July 19.
| A．to， on | B．in， on | C．in， in | D．at， in |
Now the air in our town is __ than before.
Yes. Something must be done to stop the pollution.
| A．even worse | B．rather bad |
| C．very good | D．much better |
I like watching people _____in the street.
| A．walking | B．walked | C．to walk | D．be walking |
Is that ____cat, Ross ? No, _____is white.
| A．his , his | B．her, his | C．hers, his | D．his, her |
Our National Day falls ___ October 1 and thousands of cars pour into freeways ___ the early morning of the holiday.
| A．on; in | B．in; on | C．on; on | D．in; in. |
—My sister is on holiday in Hainan. —I wonder ____.
| A．When she came back. | B．When did she come back |
| C．When she will come back | D．When will she come back |