The doctors tried their best to save the patient’s life, _____ failed.

The wireless video camera is ________to send its video signal to a nearby base station，allowing it to be viewed on a computer or a television

The experiment is of particular importance.—— I seeWe won’t carry on with it _______ we can get the good equipment

Why didn’t you tell me there was no meeting today? I _____ all the way here through the heavy snow. [ ]

Mom called me and asked if I__________ .