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21.? | A.on | B.at | C.with | D.of |
22.? | A.more slowly | B.slowly | C.faster | D.fast |
23.? | A.have got | B.gets | C.will get | D.is getting |
24.? | A.Video | B.A video | C.The videos | D.Videos |
25.? | A.activity | B.activities | C.activities' | D.activity's |
26.? | A.has | B.have | C.is | D.are |
27.? | A.they | B.their | C.them | D.themselves |
28.? | A.are posted | B.are posting | C.were posting | D.were posted |
29.? | A.to avoid | B.avoid | C.to spread | D.spread |
30.? | A.what the two students make | B.what do the two students make | C.how do the two students make | D.how the two students make |