Is

Tom is so talkative. I'm sure you'll soon be familiar _______ him.

Modern education is ___________ because of its failure to meet the ever-changing needs of the society.

The problem with some of these drugs is that they are so _______.

The hot-tempered boy is ___of violence

What is the train ____________ to Birmingham?

Tennis is a _______ invented by an Englishman one hundred years ago

To call the music of anther music-culture “primitive” is ___one’s own standards on a group that does not recognize them

The letter is so confusing that I can hardly make any _____ of it

电路如图2-9所示，电流源IS=2A(t≥0)，电容初始电压ｕ(0)=1V，则在t=3s时电容电压ｕ和电容电荷Q为(      )

图2-1所示电路中，当R2增大时，电流源IS两端电压U将      。