Last Sunday，we took ________ guided walk around by ________ signs of the famous town.
| A．the；the | B．a；/ |
| C．the；/ | D．a；the |
All flights __________ because of the snowstorm, we decided to take the train.
| A．were canceled | B．had been canceled |
| C．having canceled | D．having been canceled |
The little boy, __________ two attempts to climb over the fence of the garden, decided to have another try.
| A．having made | B．making | C．made | D．has made |
__________ out of work for a few months, mother took up the job of waiting on patients in the hospital.
| A．To be | B．Being | C．Having been | D．Having |
__________ in the restaurant for half an hour, I suddenly realized I had left my wallet at home.
| A．To wait | B．Having waited | C．Having been waited | D．To have waited |
The young man, __________ abroad for two years, decided to go back to his motherland.
| A．to work | B．working | C．having worked | D．to have worked |