________ a child begins school, he enters a world of fierce competition where success and failure are clearly defined and measured.
The roof fell _______ he had time to dash into the room to save his baby.
Rock climbing is _______ great fun. You will get close to _______ nature and take adventures at the same time.
When the teacher came in, the students pretended _____ the text.
In order to continue to learn by ourselves when we have left school, we must ______ learn how to study in the school now.
—I think G.E.M. is a talented singer. —I agree with you ______.