A. scientist B. climb a hill C. stroll D. clean the floor A. ferry B. underline C. kitchen D. poor A. naturally B. two C. longan D. on the weekend A. drop by B. play computer games C. intimate D. such as A. pick fruit B. brake C. emission D. Be careful A. smart B. so C. hunter D. teapot A. step B. congratulate C. challenge D. twitter A. cushion B. be pleased with C. underwater D. paint A. minimum B. bottle C. Saturday D. Chinese medicine A. educated B. dirty C. tofu D. numb