ADVANCE ENGLISH
TOEFL EXERCISE 2 7. I t is not clear when _________ , Although there are many different theories a. dinasaurs becoming extinct b. dinasaurs extinction c. dinasaurs became extinct d. did dinasaurs become extinct The explanation : the word although shows as a subordinate clause, which after the word uses "there are" which also indicates the noun is plural. So the right answer for the main clause is 'dinasaurs became extinct'. 8. The professor decided to allow the students to take the examination a second time because the low scores. The e xplanation : the word 'because' is considered wrong because the use of the word 'because' is to connect two clauses or subordinating conjunction. Whereas the right one shoul...