【小题1】She did her homework during the sports meeting. (改为否定句)
Shedidn’t; do How ; often her homework during the sports meeting.
【小题2】We watch TV four times a week.(对划线部分提问)
than; his begins; with do you watch TV?
【小题3】 His bike is new. My bike is newer. (合并为一句)
My bike is newer didn’t; do How ; often .
【小题4】这个单词是以 “a”开头（完成译句）
This word than; his begins; with “a”
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解析：
【小题1】本题中did不是助动词，而是实意动词。所以应该借助助动词来否定。因为是过去时，所以应该借助didn’t来否定；didn’后面应该用原形，所以填did。
【小题2】four times a week“一周四次”，表示频率，所以应该用How often进行提问。
【小题3】本句的意思应该是“我的自行车比他的更新。”本句是比较近，所以应该填than his。
【小题4】“以……开始”是begin with；this word是第三人称单数，所以begin应加s。