Trình độ TOEFL - Bài 1
1. Upon hatching, ________. 
2.  Some of the rainwater from clouds evaporates before ________. 
3. The truck  ________ crashed into the back of a bus scattering glass everywhere. 
4. ________ is entirely up to  him. 
5. ________ he would have come to class. 
6. All of the people at the AAME conference are ________.  
7. At an experimental agricultural station, many types of  grass are grown ________ various conditions. 
8. ________ techniques have been developed in  recent years to diagnose (genetic diseases in the developing fetus. 
9. With new technology,  cameras can take pictures of underwater valleys ________ color. 
10. _______ are prepared from flour or meal derived  from some form of grain. 
11. ________ a sizable  geographic area, it constitutes a biome. 
12. Modern blimps like the famous  Goodyear blimps ________ the first ones in that they are filled with helium  instead of hydrogen. 
13. Although the Ojibwa Indians fought  frequently with the Sioux, they didn't have ________ with early white settlers.  
14.  In a hot, sunny climate, man acclimatizes by eating less, drinking more liquids,  wearing lighter clothing, and ________. 
15. Some forms of mollusks are extremely  useful as food, especially the bivalves ________ oysters, clams, and scallops.  
16. It is now believed  that some damage to tissues may result ________ them to frequent X-rays. 
17.  Rhododendrons would rather ________ in shady places, and so would azaleas.  
18. Recently, there  have been several outbreaks of disease like legionnaire's syndrome, and doctors  don't know ________. 
19. American author John Updike,  ________ spent his boyhood in Shillington, Pennsylvania. 
20. He entered a university________. 
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