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一.写出下列数字的英文表达。1.13（）2.15（）3.18()4.20()5.17()6.12()7.11()8.19()二.请找规律，在横线上写出正确的英文数字。1.one,three,five,(),nine.2.four,eight,twelve,sixteen,().3.fifteen,twelve,(),six,three.4.nineteen,seventeen,(),thirteen,eleven.三，翻译下列句子。1.Howmanypensarethere?2.Thereareelevensquare.3.Icanseesixteenbirdsinthesky.4.Icanbuynineapplesintheshop.