【推荐1】It was not long ______ she learned those poems by heart. （用适当的词填空）

【推荐2】The field research will take Joan and Paul about five months; it will be a long time _________ we meet them again. (用适当的词填空)

【推荐3】I didn't recognize Uncle Li ________he took off his mask.  (用适当的词填空)

【推荐1】He would even stay outside in a storm, not coming back _______ he knew he had the right photos. (用适当的词填空)

【推荐2】My mother enjoys listening to music ______ my father likes playing chess.(用适当的词填空)

【推荐3】________you can learn to appreciate the challenges in life, you will find inner strength. （用适当的词填空）

【推荐2】Unfortunately, Puccini died of a heart attack _____________ he completed this final scene, and it had to be completed by one of his former students, Franco Alfano. (用适当的词填空)

【推荐3】You see the lightning ____________ instant it happens，but you hear the thunder later.