The man in a black suit _______ be our youth worker. — I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.

I a new song last month.

Li ping’s brother is an boy.

In the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ________ we have never experienced before, ________ makes us worried a lot about nature disasters.

Thanks ________ your help, or we couldn’t finish the work ________ such a rainy day. [ ]