4 8 . HOW TO BRUSH YOUR TEETH
E x . 1 : a) proper b) wield c) death-grip d) clench e) palm f) scrub g) vigorously h) overzealous i) gums j) recede
k) exposed I) roots m) exert n) grip o) soft p) bristles q) circular r) strokes
Ex.2: 1.E 2.C 3.A
Ex. 3: 1.exposed 2.receding 3.vigorously 4.proper 5.soft
4 9 . THE BEGINNING OF SYNTHETICS
E x . 1 : a) unwind b) fine c) thread d) crushed e) silk-like f) fibre g) artificial h) synthesize i) ever-lengthening
Ex.2: 1.D 2.C 3.C
Ex. 3: 1.unwind 2.artificial 3.fine 4.ever-lengthening 5.crushed
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