s section, we will briefly describe possibleways of reducing the costs and risks ______ in doing this

“Would you have told him the answer had it been possible?” “I would have, but I ＿＿＿＿so busy then.”

ugh to be the best in a recent science competition, the student remains modest.

I have _______ to apologize for the slight damage to your recorder— Never mind

On his way home, he found a wallet ______ on the ground.[ ]