17) The major purpose of the United States Department of Education are to ensure equal educational opportunity for all and to improve the quality of education.
'for all' sounds stranges to me, but the correct answer is B, why?
21) The snapper, a large-headed fish with a long dorsal fin, is named to its characteristic way of suddenly, shutting its mouth.
B is the correct answer. to --> by, right? but the word 'suddenly' sounds strange ...
38) A most useful tool for analyzing the elemental composition of fossils is the electron probe, a modify electron microscope.
D is the correct answer, modify --> modified, right? but why not 'A most' --> 'The most' ?
Thanks:) !