please let me know if u would have an operation

Please let me know if you have any______questions.A.further If Mr Smith___back,please let me know. Please can you let me know if you are shipping anything to u would you please let me know when you have match i will go a Would you please let me know when you have match?i will go a If you have any questions please let me know without any hes if you go there,please let me know,because i have something if you have any idea ____,please let me know.(应选择哪个?） if u want me,let me know是神马意思 if he ______ me tomorrow,I would let him know if anything happens ------ the phone,please let me know. A , If you _____ busy next week ,please let me know.