29. The research in the passage points out that …
A) scientists conducted their research only among heavy sleepers
B) people who wake up at 6 a.m. and who wake 9 a.m. have the same hormones
C) the hormones that wake people up have a three, hour long ever
D) One can definitely suggest the time of having sleep
30. The researchers carried out their experiment …
A) over the entire circular period B) during a light day C) at dusk D) during lunar day
VARIANT 82
1. A liar … when he speaks the truth.
A) don't believe B) isn't believed C) believed D) believe
2. As soon as you ... where he has telephoned his parents.
A) examine B) investigate C) inquire D) find out
3. - You look tired.
A) - Did you? B) - Did I? C) - Do I? D) - Have you?
4. Allow the cake ... for five minutes before taking it out of the …
A) cool B) cooled C) cooling D) to cool
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