You are required to select one word for each blank from a list of choices given in the box. Read the passage through carefully before making your choices. Each choice in the box is identified by a letter. Please mark the corresponding letter for each choice on the ANSWER SHEET. You may not use any of the words in the box more than once.

Part I Cloze (15 points) Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in the box. Read the passage through carefully before making your choices. Each choice in the box is identified by a letter. Please mark the corresponding letter for each choice on the ANSWER SHEET. You may not use any of the words in the box more than once. A. that B. alone C. his D. concerns E. valuable F. carefully G. need H. added I. production J. soil K. than L. which It is estimated that there are now more smartphones ___1___ people on the planet. The manufacture and disposal of phones are clearly environmental ___2___ . The US ___3___ has more than a quarter of a billion phones ready to be recycled, and an extra 11 million are ___4___ to this figure every month. It is reported ___5___ less than 20% of these phones end up actually being recycled. The metals that are used in the ___6___ of smartphones are precious resources. Some ___7___ metals are often mined in extremely poor working conditions. If phones are not recycled, more and more of these metals ___8___ to be mined to keep up with the demand for new models. And when phones are buried under the ground, harmful elements leak into the ___9___, polluting groundwater. To reduce the negative effect of this problem, we should think ___10___ about how to recycle our old phones.