—Why don’t you wear your jogging shorts, mum?—Well, my legs are too skinny, if you ______ know. 

 My English-Chinese dictionary isn’t in my schoolbag. Where _________ I have put it?

—Jenny，how did your math exam go?—I thought I ________，but in fact I came in the top 10% in the class.

Nowadays, children under 1.4 meters _______________ be free to take buses in some cities. 

John _____ go there with us tonight, but he isn’t sure about it.