a waste of time or waste of time it is a waste of time doing还是t...

\u57fa\u7840\u8bad\u7ec3\u7bc7\uff0814\uff09Until recently daydreaming was viewed as a waste of time. Or it __1_____________(c

1. was considered 2. healthy 3. is 4. beyond 5. surprising 6. to 7. concentration 8. along/on 9. himself 10. that \u7565

\u662f
It is a waste of time to do something.
\u56e0\u4e3a\u8fd9\u662f\u52a8\u8bcd\u4e0d\u5b9a\u5f0f\u7684\u590d\u5408\u7ed3\u6784\u3002
It's adj. for sb to do sth for sb to do sth\u662f\u771f\u6b63\u7684\u4e3b\u8bed\uff0csb\u662fto do sth\u7684\u903b\u8f91\u4e3b\u8bed\u7684\u3002
\u5982\uff1a It is impossible for him to get up early. It's important (for me) to carry on practicing speaking for learning English.
\u52a8\u8bcd\u4e0d\u5b9a\u5f0f\u7684\u590d\u5408\u7ed3\u6784\u662f\u201cfor / of sb. to do sth.\u201d\u3002

\u6269\u5c55\u8d44\u6599
\u4e0d\u5b9a\u5f0f\u590d\u5408\u7ed3\u6784\u7684\u4ecb\u8bcd\u7528for\u8fd8\u662fof,\u4e3b\u8981\u51b3\u5b9a\u4e8e\u524d\u9762\u5f62\u5bb9\u8bcd\u7684\u6027\u8d28\u3002
\u4e00\u822c\u8bf4\u6765,of\u524d\u9762\u7684\u5f62\u5bb9\u8bcd\u662fcareful, clever, foolish, good, kind, nice, wise\u7b49,\u8bf4\u660e\u4eba\u7684\u7279\u6027\u3002
for\u524d\u9762\u7684\u5f62\u5bb9\u8bcd\u662fdangerous, difficult, easy, hard, heavy, important, interesting, necessary\u7b49,\u4e00\u822c\u8bf4\u660e\u4e0d\u5b9a\u5f0f\u52a8\u4f5c\u7684\u7279\u6027.
\u524d\u9762\u5982\u679c\u662f\u540d\u8bcd\u7528for\u3002\u5982:
1.It\u2019s a good idea for parents to allow children to study in groups during the evening.
\u5bf9\u7236\u6bcd\u6765\u8bf4,\u5728\u665a\u4e0a\u8ba9\u5b69\u5b50\u5206\u7ec4\u5b66\u4e60\u662f\u4e2a\u597d\u4e3b\u610f\u3002
2.It\u2019s wise of him to do it well.
\u5bf9\u4ed6\u6765\u8bf4,\u628a\u8fd9\u4ef6\u4e8b\u505a\u597d\u5f88\u660e\u667a\u3002

其实这个waste一定情况下是可数名词
在这里它做的就是可数名词，可数名词单数前，要用冠词修饰的，
a waste of time，就是一次浪费时间的行为，一般我们会直接说浪费时间

It's a waste of time.是正确的，是固定用法。类似的还有 a matter of money 钱的问题

习惯用法。

a waste of 是个短语，不能分开。

扩展阅读：whatsapp messenger ... this war of mine ... messenger log in ... edrawsoft edraw max ... team fortress 2 ... paperpass免费入口 ... i am coming ... captain of industry ... be aimed to do ...