H7N9 is a new kind of          .

The shoes in the box _____ too big. Would you please show me _______?

 I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .

---Daddy, shall we go swimming now?---Sorry. It’s not the right __________. I’m too tired.

—What’s your job, Henry?—I’m a ________. I work late. I’m very busy when people come for dinner.