﹣Let’s play soccer.﹣Good idea! Do you have __________ soccer ball?A. a B. an C. 不填
If there are ____trees, the air in our city will be ____cleaner.
Before the police , the alien left the shop .
We didn’t know the good news ______ he told us.
There _________ a computer in everyone's house in the future.
My sister can’t cook, I can’t, ________ .