1.Lucy,please open the window,_________? A.shall I B.will you C.won't you D.can you 2.Can we send e-mails with _______ _______ during summer hoilday? 我们可以在暑假互发邮件吗? 3.This river is 15 _______ long .And it's a _______ river. A.kilometres,200-year-old B.kilometres,200-year old 都怎么写,一定说原因呀