1．With more forests being destroyed, huge quantities of good earth ______ each year.
A．is washing away B．is being washed away
C．are washing away D．are being washed away
解析：
考查语态及主谓一致。“quantities of+名词”作主语的时候谓语动词用复数形式，首先排除A和B答案。wash away和good earth之间是动宾关系，即由于森林的破坏好的土壤正在“被冲走”，故要用被动语态。
答案：D
2．Professor Smith, along with his assistants,______ on the project day and night to meet the deadline.
A．work B．working
C．is working D．are working
解析：考查主谓一致。句子的主语是Professor Smith，故谓语用单数形式。
答案： C
