【1】建议老年人晚上不要喝浓茶，以免睡不着。（in case）

【2】在任何情况下，坚持原则、明辨是非都是明智之举。（sense）

【3】下周五考试的那天碰巧有一场他们期待已久的音乐会，这令他们非常沮丧。（There）

【4】是不是当她很难嚼东西的时候她才下定决心去那家朋友推荐的诊所看牙医的啊？（it）

【答案】

【1】It is suggested that elderly people should not drink strong tea at night, in case they may not fall asleep.

【2】In any situation, it makes sense to stick to the principle and distinguish right from wrong.

【3】There happens to be a concert which they have looked forward to for a long time on next Friday when they will have a test,which disappoints them a lot.

【4】Was it when she had difficulty chewing food that she decided to see the dentist in the clinic recommended by her friends?

【解析】

【1】考查固定短语和句型。根据汉语可知“以免”是in case，后加句子；“睡着”是fall asleep；此句用It is suggested that…句型，that从句用虚拟语气，动词用（should）+动词原形。故答案为：It is suggested that elderly people should not drink strong tea at night, in case they may not fall asleep.

【2】考查固定短语和it做形式主语。根据汉语可知“在任何情况下”是in any situation ，“有道理，明智之举”是make sense，“坚持”是stick to；句中用it做形式主语，不定式做真正主语。故答案为：In any situation, it makes sense to stick to the principle and distinguish right from wrong.

【3】考查固定短语和定语从句。根据汉语可知“碰巧”是happen to，“期待”是look forward to；本句表示“有”用There be句型；“他们期待已久的”写成定语从句修饰“音乐会”，“这令他们非常沮丧”写成which引导的非限制性定语从句，which指代前面句子。故答案为：There happens to be a concert which they have looked forward to for a long time on next Friday when they will have a test, which disappoints them a lot.

【4】考查固定短语和强调句。根据汉语可知“做某事有困难”是have difficulty doing，“决心做某事”是decide to do，用“推荐”的过去分词作定语修饰“诊所”；根据汉语可知用强调句的一般疑问句形式，被强调部分是“当她很难嚼东西的时候”。故答案为：Was it when she had difficulty chewing food that she decided to see the dentist in the clinic recommended by her friends?