reserves are very important forpreserving many animals and plants, which would _______ run the risk ofbecoming extinct.

He has made a promise that _____ the cost, he will buy the house not far away from the beach[ ]

I must apologize for _____ ahead of time.— That’s all right. [ ]

Try the new cleaner．Just a few minutes everyday—that’s all it takes—______you could have shining floors and furniture．

Our school starts _______eight ______the morning.