When food and germs collect in a small crack, our teeth ................
A.become hard
B.begin to decay
C.send poison into the blood
D.makes us feel quite ill

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VI. Read the following passage and mark the letter A, B, C, or D to indicate the correct word that best fits each of the numbered blanks.
CRITICISM
  It can take a long time to become successful in your chosen field, however (26)              you are. One thing you have to be (27)              of is that you will face criticism along the way. The world is full of people who would rather say something negative than positive. If you've made up your (28)              to achieve a certain goal, such as writing a novel, don't let the negative criticism of others (29)              you from reaching your target, and let constructive criticism have positive effect on your work. If someone says you're totally (30)              in talent, ignore them. That's negative criticism. If, however, someone advises you to revise your work and gives you good reasons for doing so, you should (31)              their suggestions carefully. There are many film stars who were once out of (32)             . There are many famous novelists who made a complete (33)              of their first novel - or who didn't, but had to (34)              approaching hundreds of publishers before they could get it published. Being successful does depend on luck, to a certain extent. But things are more likely to (35)              well if you persevere and stay positive.
(34)
A.put off    
B.bank on 
C.keep on    
D.drop in on

Fill in each numbered blank with one suitable word or phrase.
Vietnam is considered a third world country, its people live (26) _____ poverty by the millions. After the liberation, Vietnam's economy remained dominated by small-scale production, low labor productivity, (27) _____, material and technological shortfalls, and insufficient food and consumer goods. The Doi Moi reforms that were instated in 1986 have shed new light and added new features to the Vietnamese economy. (28) ____ Vietnamese Communist Party plays a leading role in establishing the foundations and principles of communism, mapping strategies for economic development, setting growth targets, and launching reforms. Doi Moi combined government planning with free-market incentives and (29) _____ the establishment of private businesses and foreign investment, including foreign-owned enterprises. By the late 1990s, the success of the business and agricultural reforms ushered in under Doi Moi was evident. More than 30,000 private businesses had been created, and the economy was growing at an annual (30) _____ of more than 7 percent. Farming systems research and the international development projects are a source of new hope for the people of Vietnam. If these recent projects are successful and Doi Moi continues on its current path the Vietnamese people may reach a new standard of living. More reforms like Doi Moi need to take place in order to create a more stable Vietnamese future.
(29) _____
A.found  
B.promised     
C.required   
D.encouraged