There"s a ______ in the fact that although we"re living longer than ever before, people are more obsessed with health issues than they ever were.

单项选择题In some California housing estates, a key alone is insufficient to get someone in the door; his or her voiceprint must also be ______.

单项选择题It will be very helpful if parents have seen the school environment and know what kind of tasks the school will ______ on the daily life of their child.