Don’t defend him any more. It’s obvious that he _________ destroyed the fence of the garden even without apology.

Two-thirds of the land ________ covered with green grass and the rest _______ covered with pine trees.

With the help of high technology, many new substances（物质）______in the past years

On weekends, I can’t relax _______, I have to _____my homework

He said that he had waited for ________.