1 Complete the conversations with the words in brackets. 用括号中的词补全对话。
(1) Bailing: Congratulations on joining the school basketball team. I haven’t decided which club to join yet.
Yiming: (as, love writing), why don’t you join the writing club?
(2) Ms Chen: You don’t look well today. What happened?
Bailing: I didn’t sleep well last night . (because, worry about the school choir show)
(3) Lu Yao: Ms Chen asked me to write about how to play an instrument.
Yiming: You may write about playing the guitar . (since, good at it)

1
(1) As you love writing
(2) because I worried about the school choir show
(3) since you are good at it

【分析】
解题时需结合对话语境，将括号内提示词组合成符合语法规则的内容，重点关注人称、时态的匹配：(1) 第一空是Yiming给Bailing的建议，需用as引导原因状语从句，主语对应Bailing用you；(2) 第二空解释没睡好的原因，主句为一般过去时，从句时态需一致，主语对应Bailing用I；(3) 第三空是Yiming给Lu Yao的写作建议，用since引导原因状语从句，主语对应Lu Yao用you，时态用一般现在时。
【解析】
(1) 括号提示词为as、love writing，结合语境需构成as引导的原因状语从句，主语为you（指代Bailing），故填As you love writing；
(2) 括号提示词为because、worry about，主句为一般过去时，从句时态需匹配，主语为I（指代Bailing），故填because I worried about the school choir show；
(3) 括号提示词为since、good at，结合语境构成since引导的原因状语从句，主语为you（指代Lu Yao），时态用一般现在时，故填since you are good at it。
【答案】
(1) As you love writing
(2) because I worried about the school choir show
(3) since you are good at it
【知识点】
原因状语从句、英语对话补全
【点评】
本题考查用给定词汇补全英语对话，核心是掌握as/because/since引导的原因状语从句的正确用法，需注意人称和时态的匹配，属于基础应用题型。
【难度系数】
0.6

2 Complete each sentence with a clause with because, since or as. 用含because, since或as的从句补全句子。
(1) Eric felt disappointed .
(2) Our team won a big success .
(3) It was an enjoyable experience .
(4) Lucy and her team members were pleased .
(5) I have no idea which school club I should choose .
(6) John complained a lot .

(Answers may vary.)
(1) because his team didn't win the competition
(2) because we worked hard, cooperated well and stayed focused on our goals
(3) since we got to work together, learned new things and had a lot of fun
(4) as they saw their hard work pay off and received recognition for their efforts
(5) because there are so many interesting choices and each one has its own special activities
(6) because the project became more challenging than he had expected

【分析】
本题要求用because、since或as引导的原因状语从句补全句子，解题思路为：1. 明确三个连词的用法差异：because表直接、强烈的原因，since表已知的、显而易见的原因，as表双方都清楚的原因（语气较弱）；2. 分析每个主句的语义（结果或状态），结合生活逻辑补充合理的原因；3. 确保从句与主句逻辑连贯、语法正确。
【解析】
(1) 主句为“Eric感到失望”，需补充失望的直接原因，用because引导从句；
(2) 主句为“我们队取得巨大成功”，补充成功的直接原因，用because引导从句；
(3) 主句为“这是愉快的经历”，补充经历愉快的已知原因，用since引导从句；
(4) 主句为“Lucy和队友很高兴”，补充高兴的双方共识原因，用as引导从句；
(5) 主句为“不知道选哪个学校社团”，补充纠结的直接原因，用because引导从句；
(6) 主句为“John抱怨很多”，补充抱怨的直接原因，用because引导从句。
【答案】
(1) because his team didn't win the competition
(2) because we worked hard, cooperated well and stayed focused on our goals
(3) since we got to work together, learned new things and had a lot of fun
(4) as they saw their hard work pay off and received recognition for their efforts
(5) because there are so many interesting choices and each one has its own special activities
(6) because the project became more challenging than he had expected
【知识点】
原因状语从句（because/since/as引导）
【点评】
本题考查原因状语从句的运用，需结合主句语境选择合适连词并补充逻辑通顺的从句，答案具有开放性，能考查学生的语言逻辑和基础从句运用能力。
【难度系数】
0.6