1. carry on with/ go on doing/ go on with/ continue to do/ continue doing解析：注意"继续做某事"有好几种表达方式。

　　2. used to解析：考查固定词组used to"过去常常"。

　　3. is crazy about/ is (very/quite) fond of/ loves/ (much) likes/ enjoys

　　4. from time to time/ at times/ sometimes

　　5. of great value/ (very) valuable解析：习惯用法"be +of +名词=be +名词的形容词修饰"。