----Was he present a the meeting?---- He ____ not have attended it, for he was busy repairing his computer all the time.

_________ it rain, the crops would be saved.

— Did you go to the lecture by the visiting professor?— No. I ______ it, but I've been busy taking care of my grandma in hospital these days. 

“Would you have told him the answer had it been possible?” “I would have, but I ＿＿＿＿so busy then.” 

—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?—____ my students have a try?