Today, we’ll discuss a number of cases_______ beginners of English fail to use the language properly.

In our class there are 60 students, ________ a quarter wear glasses.

What if we meet with a situation _______ none of us are able to deal with?

Is this the reason ______at the meeting for his carelessness in his work?

Is this the reason _____ at the meeting for his carelessness in his work?

Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.

Most people go to the theatre not to see a play ______ plot is complicated, but to listen to brilliant dialogues between actors.

There are many things in different areas ________ we can do to reduce the possible dangers of AIDS.

We walked up a mountain to a ridge from _____ we had fantastic views、

I’ve included some photos in my letter    will help you picture the places      I
worked as a volunteer teacher.