Question

Example:
BEEN
Scientists explain excitement of children
The reason children become more excited than adults at receiving gifts has (0) .............. identified
by scientists. They found that the areas of the brain involved in processing rewards were far more
active in younger people (13) ............. they received a prize. This explained why children found
(14) ............. almost impossible to contain (15) ............. excitement on birthdays.
(16) ............. team from the US National Institute of Mental Health used scans to study
..... parts of the brain were stimulated when rewards (18)
participants. Younger people showed more activity in key brain areas while they viewed a video game
(17)
presented to
(19) received money.
........

Answer 1

13 when
14 it
15 their
16 a
17 which
18 were
19 or
20 to
21 ?
22 get