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We should study the new traffic rules and 1earn how___________ ourselves．
#49689
A
protect
B
to protect
C
protecting
D
protected
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________ hard is the key to success.
#51086
A
To work
B
Work
C
Worked
D
Works
 It is time     to school.
#49964
A
go
B
to go
C
going
D
goes
My father always makes me _______.
#50090
A
laughing
B
to laugh
C
laugh
D
laughs
The purpose of new inventions is to make life easier,      it more difficult.
#48658
A
not make
B
not making
C
not to make
D
do not make
Mary used to _____short hair.
#49101
A
be
B
have
C
had
D
has