Liu Ming is my chmistry tachr. H is an ordinary-looking littl man with thick glasss, but h has a strang way of making his classs livly and intrsting. I rmmbrd his first lsson. H put thr bottls on th dsk. On was filld with krosn, on with castor oil, and on with vingar. And h said Now watch carfully. Pay attntion to vrything that I do. H hld up on of his fingrs and dippd it into th cup aftr h mixd th thr kinds of liquid in a big cup togthr. A fw sconds latr, h took his fingr out, put it in his mouth and suckd it. How dlicious! You must do vrything that I do. said h. And thn w did it lik him. lmmdiatly w mad a fac. Th mixtur tastd horribl. It was first chmistry lsson. I nvr forgt it.