My biggest challenge is learning how to behave at the dinner

My biggest challenge is learning how to behave at the dinner My biggest challenge is learing how to b----- at the dinner My biggest challenge is learning how to get used___ ___ here AIDS is said to( have been)the biggest challenge to human ov Aids is said_____ the biggest health challenge to both men a 英语翻译AIDS is said------the biggest health challenge to both m What is the biggest challenge in the life martin is f( ) the biggest challenge in his work how to behave in the interview 英语翻译I asked to have a dinner party at the biggest hotel in m 英语翻译How to behave wellbehaving well is the key to grtting on How about going to dinner at the Mexican restaurant tonight?