英語(yǔ)翻譯：我希望我的書將闡明我們面臨的復(fù)雜問(wèn)題。
Neverbefore_______sorapidlydevelopingasitistoday．
Homingpigeonisusefulasa______carrierbecausewhentakenfromhome,itwillreturnatthefirstopportunity.
Thehostsapologizedfor______thatsomeoftheirguestsmightbevegetarians.
Itmakesgood________tobringanumbrella;itseemstoberainingtoday.
