A. LAID B. STAY C. SAID D. PAIDB. GRAMMAR & STRUCTURE I. SUPPL...

10. A. laid B. stay C. said D. paidB. GRAMMAR & STRUCTURE I. Supply the correct form of the verbs. ENERGY In mankind's millions of years on earth, many types of energy resources (1) … (utilize). However, in the last ninety years, petroleum (2)…(become) by far the most important. Accounting for over 50 percent of all energy consumed, it (3)…(be) so essential that, without petroleum, we (4) (face /not) with economic disaster. Of course, the earth's supply of petroleum (5) … (last) forever, and in fact, it (6) … (disappear) sooner than most people (7)…(believe). At the current rate of consumption, the world's proven oil reserves (8) … (exhaust) within forty to fifty years. Obviously, measures (9) … (take) decades ago to decrease our dependence on oil. Amazingly, such measures (10) … (still / discuss) today.II. Word Formation.The word in brackets at the end of each of the following sentences can be used to form a word that fits suitably in the gap. Fill each gap in this way.