We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
You should try to get a good night’s sleep ______ much work you have to do.
___________ your help, I got the first in the final-term English examination.
A middle-aged woman came ________ to the bus stop only ________ the bus had gone.
—Well, you'd better not buy that shirt. Brown and black don't go together. — ________ I wear it with my other shirt?
We won't give up ________ we should fail ten times.