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下面的句子应该用什么时态呢...

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下面的句子应该用什么时态呢...
1:When the student arrived at the lecture,the lecturer ____ (to explain) the marking criteria for the academic listening progress test.
2:By 2014,it is predicted that the population of Australia____ (to be) 23,000,000.
3:Advances in technology in the past 30 years____ (to bring) some wonderful things for communication.
4.Statistics____ (to be) numbers that represent facts or measurements.
5.The price of gold____ (to rise) at the moment.
6.The student was not permitted to do the exam because they arrived late to class and the exam____ (to start).
7.The value of the Australian dollar____ (to rise) steadily since the beginning of 2010.
下面的句子应该用什么时态呢...
1.was explaining 时态搭配 一般过去时和过去进行时搭配
2.will be 时态搭配 时间状语是by+将来的时间,所以使用一般将来时
3.have brought .Statistics in the past 30 years是一个现在完成时的时间状语
4.are 这表示的不是一个普通的学科
5.has risen 时态问题
6.started 这是一个与连词相关的问题 and 连接的结构时态一致
7.has risen 时态问题 因为时间状语是since +过去的时间点
Wish I can help you.