1 . Some children play a game called bones, which _____(sharp) the hand-eye coordination (协调) needed in hunting. (所给词的适当形式填空)

2 . Practising day in and day out helped Stephen Curry ______ his skills.

A．suspect

B．sharpen

C．detect

D．dread

3 . 1 picked up a wallet in my school and handed it to the head teacher, but no one has        it ever since.

A．spotted

B．sharpened

C．claimed

D．probed

6 . ________(sharp) up your public speaking skills, so that you can share your book with relevant audiences. (用所给词的适当形式填空)

7 . The problem with pencils is that you always have to ______(sharp) them often. (所给词的适当形式填空)

8 . The problem with pencils is that you have to __________(sharp) them after being used for some time. (所给词的适当形式填空)

9 . I have just given you 20 very practical ways to s_______(使敏锐) your mind. (根据中英文提示单词拼写)

10 . He started to________(sharp) his knife. （所给词的适当形式填空）