unit13-14
刘轶群英语课堂
stomach; fever; ripe; ought; examine; fit; gain; energy; soft; fuel; chemical; balance; tasty; mixture; sleepy; steam; theme; parade; fighting; conflict; argument; major; probably; honour; ancestor; principle; nation; purpose; creativity; faith; commercial; similar; generation; salute; celebration; respect; cycle; invitation
单词：
ought to;       plenty of; keep up with;    short of; make a right choice;   roll up; now and then;   give thanks to; in one’s opinion;   dress up; pl ...