翻译从三到十得句子，并说出句子成分

The weather has turned cold.
天气变冷了。
The speech is exciting.
演讲令人兴奋。
Three times seven is twenty one?
三乘以七是二零一？
His job is to teach English.
他的工作是教英语。
His hobby is playing football.
他的爱好是踢足球。
The meeting is of great importance.
会议是非常重要的。
Time is up.The class is over.
时间到了，课结束了。
The truth is that he has never been abroad.
事实是他从来没有出国过。