Arthur’s memory starts to go wrong because of his age. So does_______.

It was in the lab ­______ was taken charge of by Pro. Harris ______ they did the experiment.

It was last Saturday ________ we visited the History Museum.

Our teacher is very kind to us.So we regard her ________our best friend.

—Why didn’t you come to my party? I was so disappointed at your absence.—I’m very sorry. I ________ but I had a visitor at the last minute.[ ]