A. mid B. black-and-white C. pen friend D. organism A. laboratory B. overheads C. Vietnam D. advocate A. such B. hobby C. infant D. protagonist A. succeed in doing B. accumulate C. gravitational D. dividend A. analogous B. long jump C. be good for D. landmine A. a B. thermodynamics C. look down on D. hang A. Austria B. twenty-first C. all kinds of D. checker A. crossing B. be in with a chance C. imperceptible D. joy A. naturally B. finished C. told D. vulnerable A. senior B. whine C. ignore D. desertification