--- Many years has passed since I last saw you. I didn't recognize you at first.--- I , either, if someone hadn't called you by name.
There is only one of the oldest customs that ________ in this district up to now.
Modern teaching equipment as well as tens of computers _______ to the village school last week.
The number of air crashes that _______ in developing countries _________ increasing.
Bill suggested ________ a meeting on what to do for the Shanghai Expo during the vacation.
_________many times, he finally understood it.