_ we were walking along the river, we heard a cry for help.
#55724
A
While
B
Until
C
After
D
Before
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Mike is good at playing basketball ______Bruce does well in football .
#55908
A
when
B
until
C
since
D
while
— We can use QQ to talk with each other online.— Really? Could you please show me _______ it?
#55975
A
what to do
B
how to do
C
when to do
D
why to do
After you see the pictures, you will realize ______ danger the wildlife faces.
#56246
A
how many
B
how often
C
how much
D
how long