After graduation, he _____ the challenge, which _____ all his spare time.
His plan was such a good one _____ we all agreed to accept it.
Most people admit _____ the fact that it is not easy _____ into a famous university.
You ought to be stricter _____ your son; it’s no use only being strict _____ his work.
Teachers should _____ on their students the value of hard work.
The father as well as his three children _____ skating on the frozen river every Sunday afternoon in winter.