--How did you help him ___over the difficulties?--I made it by_______ him never to give up.
—Would you mind my using your computer? —______
I wonder __________ achieve a balance between my schoolwork and my hobbies.
Mother wants to spend some time chatting with me _________ she is very busy every day.
Our teacher often asks us _________ questions in groups.
In a green school, everyone agrees to be _______ about the environment.