— Did you stay at the party until the very end last night？
— No，I left as early as was ________ with politeness．
A． content B． consistent
C． patient D． Permanent
They eat only plant foods, and take care to ________ animal products from other areas of their lives．
A． contain B． maintain
C． exclude D． Include
— Could you please explain the assignment for Monday, Miss Smith？
— Certainly. Read the next chapter and come to class ________ to discuss what you’ve read.
A． preparing B． prepared
C． to prepare D． to be prepared
Home is ________ somebody notices when you are no longer there.
A． that B． when C． how D． where
—Mom！Jack has broken a cup！
—Doesn’t matter. Accidents ________ happen.
A． should B． must
C． will D． Shall
The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
A． until B． though
C． because D． Unless
