—— I’m sorry the traffic is so heavy. —— Does that _____ why you are so late?
It was _______that they went for a walk in the park.
-- Tom has made great progress. -- _______, and _______.
Sarah,hurry up,I’m afraid you don’t have time to________.
I usually don't have______ supper, but I always have ______good breakfast.
I ___ my university professor in the supermarket near my house, which was out of my expectation.