Fill in the blanks with the correct forms in the bracket.

如果支架接触到金属板，用挫刀将不需要的物质去除。 A: If the bracket touches the plate, remove the unwanted material with a file. B: Should the bracket foul the plate, remove surplus material with a file. C: If the bracket handles the plate, remove the unwanted material with a file. D: Should the bracket interfere with the plate, remove surplus material with a file.

概念题：税级攀升（bracket creep）

Fill in the blank with the appropriate form of the word given in the bracket. The illness was (diagnose)______ as mumps.

耳环 A: textile B: earings C: bracket D: accessory

Fill in the blank with the correct form of the word in the bracket. Let us _____ the possibilities for improvement. (explore)

This must be “a wet ____ ” for the cook. A: blank B: black C: blanket D: bracket

Use either the simple present or the present progressive tense with the verb in bracket. I (think ) it is important to respect other people's opinions.

201712A Structure B Directions: Fill in the blank with the proper form of the word given in bracket. When they entered the area, the visitors (require) ____________ to turn off their smartphones.

All the key words in the article are printed in ______ type so as to attract readers' attention. A: dark B: dense C: bracket D: bold