21. It is now ______ time when many governments have to meet ______ challenge of rising unemployment.
A. a; a B. a; the C. /; a D. /; the
22. Then Akira Nagata from Japan came in ________, together with George Cook from Canada.
A. smile B. smiling C. smiled D. to smile
23. --Please don’t talk over a ________ in here. People are doing their listening test.
--Oh sorry. We didn’t notice it.
A. control B. power C. noise D. whisper
