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If you have to study in your room, you will need to create a (1) .......... atmosphere that allows you to think. (2) ............ of dark colours, such as the black walls that (3) ............ to be so fashionable in the '70s, it's better to choose a colour that can help what's (4) ................. as 'brain activity'.

1.
A) clear
B) smooth
C) calm
D) gentle

2.
A) Instead
B) Rather
C) Apart
D) Except

3.
A) developed
B) used
C) turned
D) became

4.
A) called
B) remembered
C) known
D) named