to go thereР15.—This physics problem is too difficult. Can you show me _____,Wang Li?—Sure.Р A. what to work it out B. what to work out itР C. how to work it out D. how to work out itР16.—I don’t know _____ remember the new English words.Р —Don’t worry! Try to think about their pronunciations.Р A. what to B. how to C. where to?D. when toР 17.The headmaster advised the teachers _______ cell phones in class. Р A. not answer B. not to answer C. against answer D. to not answer Р 18.It’s honor _______here.A. an, to speak B. a, to speak C. an, speak D. a,speakingР 19.Remember _______ the methods that fit you best.?Р A. to choose B. choose C. choosing D. with choose Р 20.Joan ___ riding every day and won the first place in the bicycle race at last.Р A.sticks to B.gave up C.felt like D.said no to