55. Freezing foods \_\_\_\_\_ the spread of bacteria, fungi, or other microorganisms even though the process does not sterilize them. (A) retards (B) retard (C) to retard (D) is retarded III. Complete each paragraph below by filling in the blanks with correct answers. The exploration of space required the development of rockets that would be able to attain sufficient (56) to achieve extreme altitudes. In order to escape from Earth's (57), a rocket has to achieve a speed of 40,000 kph (25,000 mph), which requires a very powerful engine and a great deal of fuel. Even with the most powerful engine available, it would not be possible to (58) sufficient (59) to lift a rocket and all its fuel to the required (60). To solve this, scientists developed the multi-stage rocket.

60.(A) gravity (B) oxygen (C) proton (D) altitude Public speaking is an essential skill no matter what (61). However, many students fear public speaking although it is necessary in high school, college, and (62). To learn how to speak in public, students can join school clubs such as speech and debate clubs. They can also join community groups that meet for public speaking (63). To begin (64) for a speech, students can first write an outline or write down exactly what they want to say. Students can practice with short speeches at the beginning, about three to five minutes long, before more (65) speeches are tackled. Beginners can practice their speeches in front of mirrors, family members, and their peers. The audience can offer them some encouragement (66) constructive criticism at the end of a speech. (67) students become familiar with the process of making a speech with notes and outlines, they can learn how to make impromptu speeches. These speeches can be on nearly any topic, so students need to be familiar with a (68). It is essential that impromptu speech makers practice a different topic each week, so they will be ready with any topic they draw. Lastly, students should practice constantly, (69) them familiar with the materials.

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