All __________ people on the earth should use the natural resources wisely, or they __________ by the nature sooner or later.

The rivers will become dirtier and dirtier________ we take action to protect them.

______ get a better score, she has been studying hard all day.

_______ did Midori give her concerts aroundChina –– At the age of eight.

Have you seen Jack recently?—NoHe for another company now