--- Will you attend the meeting this afternoon? --- But I         told anything about it.

The scientist __________ the experiment for half a year, but he _______ yet.

It is the first time that I ＿＿＿ this kind of moon cake. 

Without this year’s Nobel Prize in physics winner Charles Kao’s idea of fibrotic（光纤的）communications, the “modern” telephone and Internet _________impossible．

—Can I help you，sir?—Yes，I bought this radio here yesterday，but it______.