In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement". She glanced back to make sure she (wasn't to be) observed.
590,000
625,000
6% off
1,499
2,499
40% off
590,000
625,000
6% off
3,999
5,499
27% off
590,000
0.0
5.0
5.0
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