—He looks very happy. He ____have passed the exam,
—I guess so. It’s not difficult after all.
| A．should | B．could | C．must | D．might |
24. --- How did you go to work yesterday?
--- I went to work _____ my friend’s private car.
| A．by | B．in | C．on | D．At |
23. It is said that a bridge is being built _____ the river.
| A．under | B．to | C．over | D．At |
22. We will never forget this historical lesson written _____ blood.
| A．by | B．with | C．of | D．In |
21. He is very strict with others, but he is always blind _____ his own shortcomings.
| A．for | B．to | C．with | D．In |
20. The horse is blind _____ the left eye.
| A．to | B．in | C．for | D．On |