________ did you last see him?— Two weeks ago.

The first thing ______ we should do is to tell him the news.

You should take off your shoes before you ＿＿＿ the new flat.

I’m______ building a new factory here.It will be bad for the environment. [ ]

Mo Yan, ________ordinary-looking writer from Shandong, China, was presented the Nobel Prize for Literature last year.