My mother’s birthday is coming, I don’t know _________for her.
#48742
A
what to buy
B
how to wear
C
when to go
D
why to do
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  This book is a bit difficult. ________ read something easier?
#48918
A
Why not to
B
Why don’t
C
Why not
D
Why not you
Thank you ____ me with my homework.
#49711
A
for helping
B
for help
C
to help
D
to helping
Our teacher told us          in the class.
#51008
A
don’t sleep
B
not to sleep
C
not sleep
D
not slept