By yesterday, the plane ______out of view for more than a month.

There is something wrong with Mr. Green’s eyes, isn’t there— Yes. So ____ is very difficult ______ him ______ newspapers.

What do you think of my answer to the questions — Sorry. I ________ about something else.

Many students don’t know the key to _____ their English is to practice more. [ ]

She told her boss what she had ________ mind.[ ]