We have an adviser on hand in this activity _______ you have any worries or problems.
At present,_____ number of students are near-sighted and, what’s worse, _____number of them is increasing.
--I think Nelson Mandela is a great man. Do you think so? --______ I feel that he is a true hero, too.
______, but he insisted that he _____ to school .
—Tom has won the 100-meter race.—__________! He never won it before.
A brilliant idea occurred to him, ______ to his research in the lab.