21. In no country other than Britain, it has been said, _____experience four seasons in the course of a single day.
A. people can B. you can C. can it D. can one
22. The May Flower arrived at ______is now Plymouth with 102 people on board.
A. that B. which C. it D. what
23. The visiting cousins expressed their satisfaction with their tour, _____that they had enjoyed their stay her.
A. having added B. to add C. adding D. added
