It is universally believed that a student with an extremely ________ mind usually gets high scores in the exams, especially in the physics exam.
| A．sharp | B．shallow | C．narrow | D．awful |
With many cities in China dreadfully blanketed by thick haze, the environmental problem is _____ Chinese people concern most nowadays.
| A．what | B．which | C．where | D．when |
According to scientists, our mental abilities begin to _____ from the age of 27 after reaching the highest level at 22.
| A．differ | B．shrink | C．fail | D．decline |
Smiles around the world _____ be false, _______ other feelings like anger, fear or worry.
| A．must; hide | B．shall; hiding |
| C．may; hide | D．can; hiding |
The doctor tried to laugh my brother _____ his fears about the coming operation.
| A．from | B．against | C．off | D．Into |
---Why are you so crazy about music?
--- Because I can always find in music _____ peace that is missing in _____ world full of challenges.
| A．the; a | B．the;/ | C．/; a | D．/; the |