1 . Our school __________ a lot since the new headmaster worked here.
A changes B is changing. C changed. D has changed
2. The children should avoid________ to strangers.
3. YouTube_________ to become the world’s most popular video-sharing website since 2005.
A. grows B. Grew C. Has grown D. is growing
4 . Many students enioy_______ with educational apps.
A.learning B. To learn. C. learn. D.learned
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