—What’s the best time ________ a field trip?—I think it’s spring.
---Someone is knocking at the door. Is it your brother? ---No, it be him. He’s gone to Hunan.
---Could you tell me next weekend ? ---I’ll visit Linda. She moved to this city last week.
--- Our teacher wants us to be ______ when we talk with the foreigners. ---Yes, we should believe in ourselves.
---Tom and Jack? I didn’t believe they could do the work. ---, but they really did it well.
--- I have trouble ______ my new computer. --- Don’t worry. I will show you ______.