CâuĐ/aCâuĐ/aCâuĐ/aCâuĐ/a
1A11C21shortage31because
2B12A22solution32anything
3B13C23natural33to
4D14D24safely34B
5B15A25relax35A
6D16B26unhealthy36D
7C17B27wear37C
8D18B28result38C
9C19A29care39B
10B20B30disappearing40D