Fill in the articles a/an/the/— where necessary1) They go by air, but this time they decided to go by sea.2) They bought tickets and travelled all through the night to Calais. 3) They were in time to go on the board the ship waiting at the quay.4) They went straight down to a restaurant for breakfast.5) They saw that the coast of France was disappearing and ahead were the white cliffs of Dover.6) They joined many passengers who were leaning on the rails watching the English coast.7) It seemed much more exciting than getting off a plane at the London Airport.8) At the entrance to the Customs Office their passports were checked. 9) An officer did not ask them to open their cases and in a minute they were through the gate, on the platform and seated on the London train.