Victor apologized for _________ to inform me of the change in the plane.
| A．his being not able | B．him not to be able |
| C．his not being able | D．him to be not able |
24. Let’s learn to use the problem we are facing________a stepping-stone to future success.
| A．to | B．for | C．as | D．By |
23. ––––When can I come for the photos？I need them tomorrow afternoon.
––––They _____ be ready by 12p. m.
| A．can | B．should | C．might | D．need |
22. Is this factory _____ you visited the other day？
| A．where | B．that | C．the one | D．when |
21. In recent years _____ global warming is becoming ____concern for people all over the world.
| A．the; the | B．/; a | C．/; / | D．the; / |
Nowadays people have to pass various tests for professional __________ so that they can be qualified for a well-paid job.
| A．certificates | B．permission | C．admission | D．Perseverance |