_____ worries the doctor most was _______they could find the cause of the disease.

－I’d like to know _____. –Maybe in the forest.

How can we become good at playing basketball — ____ practicing it as much as possible.

–Are you cleaning my room —I can’t help ______I can’t bear seeing people’s room ina mess!

Jenny, can I see Ms. Lewis—____. I’ll tell you’re here.