Doing eye exercises         well in         our eyes. 
#58227
A
work; protecting
B
works; protecting
C
works ; protect
D
work; to protect
推荐题目
---Who _______ the book _______? --- It was written by Lu Xun.
#53239
A
is …written by
B
did ,write
C
was, written
D
was, written by
We had a bad weekend. It ________ all the time. 
#53103
A
rains
B
has rained
C
is raining
D
was raining
Be quick! Jim _______________ for us downstairs.
#53584
A
waits
B
is waiting
C
will wait
D
waited