A. ride a bike B. fall down C. red-crowned crane D. what's wrong A. March B. English book C. disagree D. grass A. gain B. hundreds of C. seventh D. immaculate A. better B. sculptor C. cell D. part A. representative B. space station C. break into D. simplify A. man-made B. scary C. build D. upper A. make progress B. scientist C. beat D. sea A. strike B. inside C. hitchhike D. driver A. factory B. logical C. paper clip D. watch out A. paper B. sort out C. cliche D. peaceful