How long _____ in this job? – Since

Which shirt will you take, the white one or the blue one?— _______ , just for a change.

I think _____ of the materials I listen to at the beginning of the exam _____easy.

Mr Wang has worked as _______ English teacher for more than 10 years.

We all think that _____ no need to make laws to prevent the young from getting married during their college life.