根据中文释义填写单词。 小题1:Unfortunately, a new difficulty has ______ (出现). 小题2:With the development of _________ (技术）, more and more practical machines have been invented. 小题3:At first, I thought these flowers were real, but they are __________ (人造的）. 小题4:I asked his name, but he didn’t_________（响应）. 小题5:We greatly _________(感激) your timely help. 小题6:Mrs Brown's dog _________（咬）the mailman when he was delivering newspapers yesterday   afternoon. 小题7:Your proposal sounds very ___________ (吸引人的)． 小题8:He is quite___________（有信心）that he will pass the examination. 小题9:The famous band from the US will give their __________ (表演) in the Capital Concert Hall. 小题10:He is busy sending out ___________ (请帖).