The ______ look on his face suggests that his ______ report failed the test.

  The meaning of the word is various ______ different situation.

.—English has a large vocabulary, hasn’t it?--Yes._____ more words and expressions and you will find it easier to read and communicate.

Be careful when you deal with this chemical, as it will explode when ______ to sunlight.

______from space, the earth with water _______70％ of its surface looks like a “blue blanket”.