Only after my friend came .

I remember a _____ famous scientist said that we should believe in ourselves first of all.

Many people can’t learn any lessons from the mistakes they’ve made _____ they get hurt somehow.[ ]

Many people watched CCTV’s Dictation Assembly of Chinese Characters(汉字听写大会). It had a great ____on developing our native language.

Hi, Johnson, any idea where Susan is?— It’s class time, so she in the classroom now.