23. Mr. Smiths was busy writing a story, only ______ once in a while to smoke a cigarette.
| A．to stop | B．to have stopped | C．being stopped | D．stopping |
28. The stream in front of our village will dry_____ when early autumn comes around.
| A．out | B．away | C．off | D．Up |
27. _____ the teacher came in, everyone was quiet.
| A．Direct | B．Directly | C．Directly when | D．Direct when |
26. She is very diligent. She often studies _____ into the night.
| A．deeply | B．deep | C．farther | D．Later |
25. The article is too long, please cut _____ some unimportant details.
| A．out | B．in | C．up | D．At |
24. China Construction, an edition de luxe is not a weekly or bimonthly magazine but it comes _____ every season (quarterly).
| A．over | B．about | C．out | D．Of |