I won’t tell the student the answer to the math problem until he ______ on it for more than an hour.
| A．has been working | B．will have worked |
| C．will have been working | D．had worked |
30. She had no idea how it _____ that her husband met with trouble again.
| A．came about | B．came out | C．came across | D．came up |
29. As far as I’m concerned, education is about learning and the more you learn, ______.
| A． the more for life are you equipped | B． the more equipped for life you are |
| C． the more life you are equipped for | D． you are equipped the more for life |
28. The Olympic Games are being _____ live to many countries.
| A．conveyed | B．transferred | C．demonstrated | D．Transmitted |
27. The child tiptoed quietly to the bird, _____ into the forest when he was about to catch it.
| A．Flew it away | B．Away flew it | C．Away it flew | D．Flew away it |
26. Mr. Green has two sons, one of _____ working as a bus driver now.
| A．who | B．whom | C．them | D．Whose |