342. for good (=for ever) 永远地, 长期地
343. take…for granted (=assume to be true) 把…认为理所当然的.
344. be grateful to sb. for sth 因…感谢某人
345. on the ground(s) fo (=because of) 由于…
346. fall to the ground (计划.希望等)失败,落空
347. on one’s guard(against) 谨防, 警惕 (be) on guard 站岗
348. guard against (=defend, keep safe)警惕,防止 guard…against 警卫…防止
349. guess at 猜, 估计
350. by guess 靠猜
