That _____ my ruler.

There is a computer _______ the desk.

It’s reported__________the new underground line has been completed.—Yes, but it hasn’t been made clear ________ it’s to be opened to traffic.

___ he was ill, I was expected to take his place greatly surprised me for I didn’t have much working experience.

Microblog is a platform ________ people can expresstheir thoughts and communicate with each other by sending posts.