1.The pen i bought yesterday_____
A.writes well B.is written well
注意write有及物和不及物两种用法,此处是不及物.
A)（钢笔）写起来好用
B）被动语态,也就是“钢笔被写”,显然不符合逻辑,只有文字才能被写.如果改为write with还有些道理.
2.The house the old couple live in requires_____
A.paintingB.being painted
need, want和require后面的动名词作宾语表达被动,即“房子需要被涂油漆”其它例子如：The bike needs fixing. 想用被动表达也行,但必须把动名词改作不定式：The house the old couple live in requires to be painted
3.If ______,water will be harmful to human life.
A.polluted （表示“总被污染”） B.being polluted（表示正被污染）
根据题意,当然应该选 A.