Some people waste a lot of food _______ others haven’t enough to eat.
With more and more birds _______, some day some species will _______ completely. In addition, some of them have _______ environmental pollution.
His test results are not very consistent. He does well __________week and badly the next.
—Yousee, I'm poor in maths; you are not good atEnglish, and. . . — That's __________ we should help each other.
—Can you accompany your little brother to the post office now?—__________,if he is ready.
Only if __________ the examinations __________ get the gift promised byyour father.