She was so amused with the magician’s tricks that she _______ a smile.
24. --- How did you go to work yesterday? --- I went to work _____ my friend’s private car.
23. It is said that a bridge is being built _____ the river.
22. We will never forget this historical lesson written _____ blood.
21. He is very strict with others, but he is always blind _____ his own shortcomings.
20. The horse is blind _____ the left eye.