In my opinion, what Fei Junlong and Nie Haisheng ___ good to our country’s international positions.[ ]

I have no idea ________ the cell phone isn’t working, so could you fix it for me?

Look! There is a crowd of people over there. Go and see what ________ and if it is a bargain, buy it. [ ]

In the middle of the lake _____ which looks very beautiful.

day I was walking downstairs when I missed myfoot and had a bad fall, nothing serious, ______.