cancel v. 取消
care v. 关心；careful adj. 仔细；careless 粗心
cause v. 导致 n. 原因
celebrate v. 庆祝；celebration n. 庆典
challenge n.&v. 挑战
change v.&n. 改变
charge v. 收费，负责 in charge of
choose v. 选择（chose chosen）choice n. 选择
collect v. 收集；collection n. 收藏品
communicate v. 交流；communication n. 沟通