()To help protect the Earth, I will the Green Earth Club.

A.join
B.join in
C.take part
D.take part in
点拨 句意为“为了帮助保护地球，我将加入绿色地球俱乐部。”设空处想表达的是“加入……俱乐部”，表示加入某团体或组织，应用join。故选A。

[反馈练习]从方框中选择合适的选项补全句子或对话。（每个选项限用一次）
A. join B. take part in C. join in
1. —Will you me for a drink tonight? —Sure! I’d love to.
2. Mr Wright leads a student team to a competition for the Clean Plate Campaign.
3. I need to go to bed early because I’ll a meeting as the host（主持人）tomorrow morning.