根据下面的对话情景，在每个空白处填上适当的句子，使对话的意义连贯、完整。

A: What's your favorite season, Tim?

B: . Because in spring the weather gets warmer and warmer, and I can plant trees.

A: ?

B: Yes, we plant trees every year.

A: ?

B: Because trees are important to us. We should plant more trees and protect them well.

A: Tomorrow is Tree Planting Day. ?

B: Sure. Welcome to join us!

A: ?

B: Let's meet at the school gate at 8:00 a. m.