11：Rom admits that watching TV sometimes distracts him ______ his homework.1.out 2.off 3.from 4.in 12：Writing is a slow process,requiring _________ thought,time and effort.1.significant 2.considerable 3.enormous 4.numerous 13：Then Johnny reached quickly ___ the other pot,vigorously boiling on the stove.1.down 2.out 3.for 4.to 14：The machine can pull up trees as if they ______ weeds (野草,杂草).1.were 2.have been 3.are 4.had been 15：I don’t think I’m ______ of your success at your present job.1.envious 2.obvious 3.happy 4.awful 16：We must focus _______ our sales force as the chief means of improving trade.1.to 2.in 3.on 4.with 17：They took ______ measures to prevent poisonous gases from escaping.1.fruitful 2.valid 3.beneficial 4.effective 18：Our team has no ______________ of winning.1.occasion 2.luck 3.chance 4.favor 19：The enemies fought hard,but finally they had to give ______,because their food supply was cut off.1.in 2.off 3.out 4.away 20：By careful study it was found out that this church was ______ in the 18th century.1.equipped 2.defined 3.represented 4.established