11. He is not good at English, so it is not easy for him to make himself ______.
A. understand
B. understanding
C. understood
D. understands
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12. If you wave your book in front of your face, you can feel the air ____ against your face.
A. moved
B. moving
C. moves
D. to move
13. “Can't you read?” Mary said ,____ to the notice.
A. angrily pointing
B. and point angrily
C. angrily pointed
D. and angrily pointing
14. ____ a reply, he decided to write again.
A. Not receiving
B. Receiving not
C. Not having received
D. Having not received
15. The visiting Minister expressed his satisfaction with the talks, ____ that he had enjoyed his stay here.
A. having added
B. to add
C. adding
D. added