Nanjing is about 1,100 km away from Beijing and it’s nearly a ________ ride by high-speed train.
He said that he had met her two years _______.
She said she would return the dictionary to me ________.
The police ____ still not sure ______ the young man killed himself or was killed.
You had better ________some food and drinks before the field trip ________.
—How many students do you think are still on the playground now? —I am afraid there are few of them, ______?