This question is ______ easy, all the students can answer the question

They are broadening the bridge to ________ the flow of traffic.

Your experiences are ______ to ours, but your end result is entirely different. [ ]

With his attention _____ on his book, he didn’t notice me enter his study.

Do you think the business via Wechat should be banned—________ the businessmen are honest and guarantee the quality, it should be permitted.