I'm going for a field trip but I haven't decided_________.
— It’s dangerous to walk across the street carelessly. — You’re right. We can’t be careful while crossing the street.
It’s quite clever ________ you _______ out the problem.
---Tom, you play football in the street. ---Sorry, I do it again.
Not only Mr. and Mrs. Green but also their daughter ________ to China twice.
Could you tell me ____________ a meeting in Guangzhou next week?