1) I hope to show you that sleep is very important.  I hope ........... you that sleep is very important. a) to show b) show c) showing 2) Scientists are starting to understand sleep much better than before. Scientists are starting .................sleep much better than before.  a) understanding b) understand c) to understand 3) Some adults need ........... for 10 hours or more a day. a) sleep b) to sleep c) sleeping 4) Elderly people tend ........... less than younger adults at night. a) sleep b) to sleep c) sleeping 5) I apologize for ......... some rather technical language. a) using b) use c) to use 6) I want ............ about things that can stop us sleeping well at night. a) talk b) talking c) to talk 7) I’ve succeeded in ........... you that sleep is very important. a) showing b) show c) to show

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