—Kathy and her sister are so alike.—I can’t tell one from ____.
___________ 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.
We are _______ happy to hear of the success of their team.