Is this the reason _____ at the meeting for hiscarelessness in his work

Have you been to Suning Plaza(苏宁购物中心) in our city–No. Although it for more than a week, I’m far too busy to go there.

Was it in the train “Harmony”, which is China’s first highspeed one, ________ John met with hisforeign friend?[ ]

As the New Year is coming, we have ____________ preparation work to do.

Some people disagree with the idea _____digital textbook will improve education quality while the traditional textbookis out of date