Their youngest girl is at the stage ______ she can say a single word but not a full sentence

A. when B. which

C. that D. where

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

Are you facing a situation that looks impossible to fix?

In 1969, the pollution was terrible along the Cuyahoga River near Cleveland, Ohio. It 1.(be) unimaginable that it could ever be cleaned up. The river was so polluted that it 2.(actual) caught fire and burned. Now, years later, this river is one of 3._most outstanding examples of environmental cleanup.

But the river wasn’t changed in a few days 4.even a few months. It took years of work 5.(reduce) the industrial pollution and clean the water. Finally, that hard work paid off and now the water in the river is 6.(clean) than ever.

Maybe you are facing an impossible situation. Maybe you have a habit 7.is driving your family crazy. Possibly you drink too much or don’t know how to control your credit card use. When you face such an impossible situation, don’t you want a quick fix and something to change immediately?

While there are 8. (amaze) stories of instant transformation, for most of us the 9._(change) are gradual and require a lot of effort and work, like cleaning up a polluted river. Just be 10.(patience).

By serving others, a person focuses on someone other than himself or herself,_____can be very eye-opening and rewarding.

A. who B. which

C. what D. that

Chan's restaurant on Baker Street,___________used to be poorly run, is now a successful business.

A. that B. which

C. who D. where

____I explained on the phone, your request will be considered at the next meeting.

A. When B. After

C. As D. Since

____is often the case, we have worked out the production plan.

A. Which B. When

C. What D. As

It is reported that two schools,_____are being built in my hometown, will open next year.

A. they both B. which both

C. both of them D. both of which

We shouldn't spent our money testing so many people, most of_________are healthy.

A. that B. which

C. what D. whom

The book was written in 1946, _________the education system has witnessed great changes.

A. when B. during which

C. since then D. since when

Last month, part of Southeast Asia was struck by floods, from_____effects the people are still suffering.

A. that B. whose

C. those D. what