Bought 解析：这句的主语是 the vegetables,buy 和 the vegetables 是动宾关系,
即：买蔬菜或蔬菜被买,所以用 buy 的过去分词 bought ,
Bought in that shop 做 the vegetables 的前置定语.
to be finished 解析：work 和 finish 一样是动宾关系,即：完成工作或工作被完成,
所以要用 finished ,因为 tomorrow 是将来时,所以用 to be finished,
动词不定式 to do 有将来的含义.