That suggests that catch-up sleep may undo some but not all of the damage that sleep deprivation causes, which is encouraging given how many adults don’t get the hours they need each night. Still , Liu isn’t ready to endorse the habit of sleeping less and making up for it later. (CET6-2015.12)
A.
express formal support or approval for someone or something
B.
sign your name on the back of a cheque to show that it is correct
C.
say in an advertisement that you use and like a particular product so that other people will want to buy it
D.
to write details of a driving offence on somebody's driving license