If Mr Smith___back,please let me know.

If Mr Smith___back,please let me know. If Mr Green__ back, please let me know（come) if anything happens ------ the phone,please let me know. A , If you _____ busy next week ,please let me know. Please let me know if you have any______questions.A.further please let me know if he ------------(come) tomorrow? if you want to go to ( ),please let me know If you find the key ,please().A let know me B let me know C I don't know if he_.if he _home,please let me know.(return). Do you know when Mr .Brown When he ,please let me know. If you know ( ) who knows the answer,please let me know. If you know when he will come,please let me know.(改写同义句)