—What is your plan for next weekend,Lingling?
—I _____ volunteer work in the museum.
本题考查动词的时态。
根据问句“玲玲，你下周末的计划是什么？”可知，答语要用一般将来时，故am going to do 符合题意。
—Would you like to go to Shanghai Disneyland with me in July?
—______.
本题考查“Would like to do sth？”句型的答语。
Yes,I'd like to是的，我想去；It doesn't matter没关系，不要紧；Have a good time祝你玩得开心；You're welcome不客气。问句的含义是“七月你想和我一起去上海迪士尼乐园吗？”，合适的答语是“Yes,I'd like to.”，故答案为A。
My brother joined the army _______ September last year.
在具体的某个月份前用介词in。
根据设空处后的“九月”可知，所缺的词是in。