—What’s the best time ________ a field trip?—I think it’s spring.
If I _____ you ,I _____ them the story.
Everyone knows that Taiwan belongs _____ China.
--Would you mind my ______ the window?” --“ ______. But don’t do it now.”
Don’t worry. All the children will_____ arrive at school on time tomorrow.
The sentence structure of “They painted the walls white” is _____________.