-Can you help me with the maths homework, mom?-You can't always ________others' help for your homework.Do it by yourself this time, dear.
—Dad, would you buy me an MP3 player if I do well in the final exam? —I _________, I promise.
–I’m sorry but I must be going off now. --Ok, __________.
Can you think of some cases ___ drivers obviously knew the traffic rules but didn’t obey them?
It is such a difficult problem _______ no one can work out.
–Well, where did you spend your night that day? --At __________.