Every possible means _____ to prevent the air pollution, but the sky is still not clear. [ ]

I think students should have mobile phones to call their parents.–_______ . They often use them to play game instead.

The old man _______three months ago. That’s is to say, he ________ for three months

下列对古诗词的赏析不恰当的一项是（ ）春花秋月何时了往事知多少！小楼昨夜又东风，故国不堪回首月明中。 雕栏玉砌应犹在，只是朱颜改。问君能有几多愁恰似一江春水向东流。 （《虞美人》）

If you feel tired out and unable to think clearly,that is________you have to get a rest[ ]