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1. While play is important at all levels of human development _________ takes on particular significance when children are five and six years old.

A. it

B. and

C. which

D. because it

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2. During the second and third years of life children gain _________ over their bodies.

A. control increasing

B. increasing to control

C. control is increasing

D. increasing control

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3. All brass instruments use a mouthpiece _________ into a long cone-shaped tube.

A. is ed

B. that ed

C. that is ed

D. and ed

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4. By the mid-twentieth century United States presidential staffs _________ had numbered fewer than ten a century earlier numbered in the hundreds.

A. as

B. that they

C. which

D. and

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5. In 1966 only 60 percent of all five year olds in the United States attended kindergarten _________ in 1985 almost 82 percent did so.

A. with

B. which

C. whether

D. while

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