I think _______ is meaningful to help other people.

Take care! Don’t get the oil on your clothes, for it _______ easily.

It’s 12 April today. Have they found any useful information about the plane’s black box?—Flight MH370? Yes, but it’s difficult to decide where the black box really is.

The machine is made _______ metal and is made ________ China.[ ]

Where is my pen ? Have you seen ____?— Oh, sorry. I have taken ____ by mistake.