Everyone should learn something about first aid，for every second will ________ in an emergency.
| A．play | B．count |
| C．happen | D．show |
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二：语法和词汇知识（共20小题，每小题1分，满分20分）。
6._________we must keep in mind is that we must protect water and use it wisely.
| A．Why | B．What | C．Where | D．How |
20．Helen devoted herself__________to her research and became a top scientist in the field of applied physics.
| A．seriously | B．extremely | C．entirely | D．Strictly |
19．Vitamin D helps our bodies make a special chemical, and this special chemical,________,affects our brains, making us feel happy.
| A．in turn | B．in particular | C．in advance | D．in short |
18．Everyone must have known the death of the waitress, __________?
| A．must they | B．mustn’t they | C．haven’t they | D．have they |
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