对于一些学生，批评容易使他们产生消极情绪，而表扬往往令他们振奋起来。所以对这些学生的德育要坚持（ ）的原则。

(单选题)—Excuse me for getting in your way.—______. (单选题)This is a latest technological product. ______ very familiar (单选题)______ I like economics, I like sociology much better. (单选题)Circumstances ______, I’ll go abroad to study. (单选题)New Year party is a great occasion. It is essential ______ f (单选题)Your ideas, ______, seem unusual to me. (单选题)Which teacher ______ will come to class this afternoon? (单选题)I saw a man shouting at a driver ______ car was blocking the (单选题)Officer, one of my neighbors ______ for three days. (单选题)This is a comprehensive university, of which mathematics ___