As the quality of the city’s air continues to give rise to ________, the residents are encouraged to drive cars less often. 
#13144
A
descriptions
B
compromise
C
concerns
D
emergency
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(2013·北京高考)Volunteering gives you a chance ________ lives, including your own.
#11379
A
change        
B
changing
C
changed
D
to change
 As soon as she saw her boyfriend, she ________ crying.
#13078
A
burst into
B
broke out
C
burst out
D
broke in
I catch cold now and then.
#13656
A
always
B
occasionally
C
constantly
D
regularly