下列各组句子中，加横线的词的意义和用法不相同的一组是（ ）

The Internet is increasingly accessible at school and at home _____many parents and teachers are sometimes not as prepared as we should be to warn children about Internet threats

It’s high time we＿＿＿＿＿＿＿ to the theater.

. The little boy is dirty from head to footbecause he ___ in the mud all morning.

At times _______ exercise can make us _______.