When it was his turn to deliver(发表) speech, ______, he walked towards the microphone.
The soldiers tried their best and did what they could _______ against the flood.
_______ for the breakdown of the school computer network,Alice was in low spirits.
Helen had to shout _______ above the sound of the music.
Just then,another man, _______ behind the first,spoke up,“Who are you?”.
You were silly not _______ your car.