Eye doctors recommend that a child’s first eye exam ____at the age of six months old.
Thank you for the trouble that you had ________me with my studies.
---Are you still busy? ---Yes, I _______my work, and it won’t take long.
It’s impossible for all the people to get jobs because ________of them are not fit for them.
______ in the snowstorm for two hours, the driver called 110 and he was rescued in _____ end.
Though he was____ trouble after he was wounded, he managed to escape____ caught by the enemy.