All of us are busy going over our lessons, as the Mid-term exam is _________.
In many people’s opinion, that company, though relatively small, is pleasant _______.
Let’s not wait any longer, he might not _______ at all.
Special attention should be paid _______ our earth from _______.
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.