【正文】 e19．— You see, more and more cows are getting sick. —If the problem is so ________, the farm will be closed from tomorrow on.A．heavy B．popular C．strong D．serious20．It39。s very ________ for teenagers to feel a little bit worried and stressed because most of us have such feelings.A．mon B．strange C．curious D．energetic21．—Henry, you seem ________ than before. What are you doing these days?—Well, I am preparing for the ing examination.A．busier B．happier C．lazier D．healthier22．—I always get the best grade in my class, but I’m feeling stressed.—Why? Are your parents too ________ with you?A．a(chǎn)ngry B．satisfied C．bored D．strict23．—We’re late! It’s already 7:30.—Don’t worry. My clock is 20 minutes ________.A．fast B．late C．slow D．early24．—What do you think of the new car produced by BYD?—Oh, its improved system gives people a ________ ride even on mountain roads.A．similar B．terrible C．strange D．smooth25．Sadly the number of the tigers is getting ________.A．more and more B．fewer and fewer C．smaller and smaller D．less and less26．Students should be ________ that even a small thing like saving water and looking after a tree can make a big difference to our environment.A．a(chǎn)lone B．a(chǎn)wake C．a(chǎn)ware D．a(chǎn)fraid27．Although this may sound like a ________ process, great care is needed.A．stupid B．similar C．simple D．strict28．—How was your exam the day before yesterday?—Well, I feel quite good. I made ________ mistakes than before.A．fewer B．the fewest C．less D．the least29．I like collecting old stamps because they are ________.A．simple B．valuable C．impossible D．natural30．—Linda is practising the violin for an hour these days.—I see. It’ll make her ________ enough to perform on stage tonight.A．a(chǎn)ctive B．humorous C．confident D．patient31．— How do you find the price now? — As a ________ rule, prices follow needs.A．private B．general C．central D．difficult32．—Like so many creative people, he was never ________.—That’s why he has made lots of valuable paintings.A．cheerful B．skillful C．satisfied D．surprised33．—Have you found that more and more visitors e to our hometown?—You’re right. That’s because we’re now building Huai’an a ________ city！A．live B．lively C．living D．a(chǎn)live34．The fruits are ________ because they were picked from the garden just now.A．healthy B．beautiful C．fresh D．natural35．Our monitor Jenny is so ________ that she always keeps things in good order.A．organized B．practical C．generous D．modest36．This is the chance he needs to make a ________ start.A．curious B．patient C．fresh D．natural37．David promised to help me with my physics last Sunday. But to my great disappointment, he never appeared that does the word “disappointment” mean in the sentence?A．The feeling of being nervousB．The feeling of being lo