A Wechat (微信) is an invention __________ can help people talk to friends, share photo, ideas and feelings freely.

There is a _________ belief that the company is in financial trouble.[ ]

I left my pen on the desk and now it’s gone; who _____ it?

清代王文儒评此文“隐”字“侠”字是一篇的主脑，下面能够表现出方山子“侠”特点的一组是（ ）①方山子怒马独出，一发得之　 ②庵居蔬食，不与世相闻　③精悍之色，犹见于眉间　 ④晚乃遁于光、黄间　⑤从两骑，挟二矢，游西山

s experiment, the famous professor showed three different ________ to the study of physics.