Mary, have you got my email? I sent you a birthday card yesterday. —Oh, really! I haven’t ＿＿＿my mailbox yet.

(2013·潍坊高考模拟)Air pollution is getting more and more serious，so we must take action________it is too late

Without electricity human life __________ quite different today.

Who’s your favorite ________ in Rio Olympics— Well, I like Zhang Jike best.

Excuse me. a hotel on Center Street -No, there isn’t.