－Are you sure you have to? It’s been so late. Make it another time?－I don’t know ________ I can do it if not now.
#31948
A
how
B
what
C
when
D
that
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Perseverance is a kind of quality, and that’s ______ it takes to do anything well.
#33530
A
what
B
that
C
when
D
why
Find ways to praise your children often,_____ you’ll find they will open their hearts to you.
#32927
A
till
B
or
C
and
D
but
I thought we'd be late for the concert，________ we ended up getting there ahead of time.
#30474
A
but
B
or
C
so
D
for
To improne the pmlity of our products we uaked for nuggratior a had used the producu.
#34749
A
whacver
B
who
C
whichever
D
which