＿＿＿so many careless mistakes in his writing, Tom was told to write another passage carefully.

Not everything that is best for nature is good for people.— Yes, would anyone say that economic development should be stopped ______ nature?

The number of pages in this dictionary ________ about two thousand.

Do you know about a very popular toy— the yo-yo(悠悠球)—Yes. Filipinos(菲律宾人) invented it ________ accident. And it ________ helping kill animals.

They will fly to Washington, ______they plan to stay for two or three days.