A. understanding B. impossible C. what a pity D. rip A. project B. meantime C. have got to D. nightfall A. landscape B. by school bus C. stay away from D. spaceship A. nitrogen B. by taxi C. environment D. forge A. no problem B. potency C. angel D. say hello to A. granny B. combative C. ball D. galaxy A. universe B. spiral C. none D. island A. put B. swam C. until D. discover A. yet B. multiply C. oilfield D. undertake A. egg B. latest C. partner D. tableland