Complete the summary using the list of words below. Choose the correct word and move it into the gap.

recent

past

lost

gain

put

difficulty

inconclusive

reveal

remain

future

immediate

poor

• The main findings of the research showed that children who were able to catch up on [1] sleep stayed fairly slim whereas children who did not were much more likely to [2] weight.
• The researchers mentioned that in [3] times a reduction in sleep time has become common with most people sleeping an hour or two less than in the past. However, the reasons why overweight children tended to sleep less on weekends than their slimmer peers [4] a mystery.