He spends as much time as he can ____ English every day.

Please ____ Mary ____ 687—8068.

It was ________I went there ________I began to knowsomething about the matter.

________what we can do, we’ll have to decrease our dependence on oil and reduce our overall energy consumption.[ ]

How is Helen in the new school— She is doing very well. There is ____ to worry about(担心).