342. for good (=for ever) 永遠地, 長期地
343. take…for granted (=assume to be true) 把…認為理所當然的.
344. be grateful to sb. for sth 因…感謝某人
345. on the ground(s) fo (=because of) 由于…
346. fall to the ground (計劃.希望等)失敗,落空
347. on one’s guard(against) 謹防, 警惕 (be) on guard 站崗
348. guard against (=defend, keep safe)警惕,防止 guard…against 警衛(wèi)…防止
349. guess at 猜, 估計
350. by guess 靠猜
