When _____ the letter, tears came to her eyes.

Large quantities of water, as well as some other timely help including a medical team ___since the serious drought hit Yunnan Province. 

This is the first time that I _____ at the meeting.

---You’re trembling. What’s happened?---- I ______ outside in the cold for over an hour waiting for a bus.

--- What are you busy with? --- The conference        in our city next week.