Answer
e
a
a
c
Explaination
1.When the researchers concealed some of the facts of the participants, This kind of behavior is regarded as cheating. It will cause some misunderstandings about the information of the participants.
2.Obviously, why people have brand awareness is a problem and a street investigation
3.A quick way to get to know others, should be to get to know him through his daily journal.
4.Research conducted in reality is of course observed in real life, not through some documents or experiments.