A. solid B. plenty of C. dinghy D. drawer A. go back to B. flag C. river D. climate A. research B. pick up C. beside D. straightforward A. fill in B. everything C. strange D. useless A. authority B. open up C. discount D. tidy A. plane B. low C. human D. today A. up-to-date B. ours C. above D. rediscover A. unclear B. paddle C. lake D. grasp A. pneumonia B. swim C. watertight D. necessity A. put B. partial C. spaceport D. household