请根据句意从方框中选择合适的动词，并用其适当时态填空，使句子通顺。
小题1:It was raining heavily when he ________ home last night.
小题2:Mary wonders what she _________ as when she grows up.
小题3:— Amy, I called you yesterday evening, but nobody answered the phone.
— Oh, I ________ a walk with my mother at that time.
小题4:—________ you ________ a letter to your mother recently?
—Yes, I wrote one last Sunday.
小题5:We are told that sound ___________ through air at a speed of about 340 metres per second.
