. ___ to nuclear radiation, even for a short time may produce variants（变异体）of genes in human bodies.
| A．Being exposed | B．Having exposed |
| C．Exposed | D．After being exposed |
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T
om was about to close the windows _____his attention was caught by a bird.
| A．when | B．if | C．and | D．till |
---- Would you please ______ the form for me?
------ _____________.
| A．fill; It’s a pleasure | B．fill in; With pleasure |
| C．fill in; My pleasure | D．fill in; I’ll be happy to |
Little ______ that we were watching his every move, so he seemed to be going his own way in this business.
| A．he realized | B．he didn’t realize | C．didn’t he realize | D．did he realize |
Just use this room for the time being, and we’ll offer you a larger one _____ it becomes available.
| A．as soon as | B．unless | C．as far as | D．until |
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