I like watching people _____in the street.
#48472
A
walking
B
walked
C
to walk
D
be walking
推荐题目
Funny jokes can make us ________when we are sad..
#49037
A
laughing
B
laugh
C
laughed
D
laughs
Thank you for __me with my English.
#50444
A
helping
B
helps
C
are helping
D
help
Students should do everything they can __their study. 
#50600
A
improve
B
to improve
C
improving
D
improved
We should study the new traffic rules and 1earn how___________ ourselves.
#49689
A
protect
B
to protect
C
protecting
D
protected