Up to now，the program________thousands of children who would otherwise have died.

The young boy has come to himself in hospital now. But he ___ unconscious for three days.

Since the recent river pollution in several provinces, people _______ more and more attention to the quality and safety of drinking water. 

I’m sure David _________ when we get home.

 I’m calling about the apartment you __the other day. Could you tell me more about it?