21. What do we know about the London Eye
A. It has fixed opening hours.
B. Pking photos in it is forbidden.
C. Its nearest bus station is Waterloo.
D. A ride on it takes about half an hour.
22. What is a must to pay a visit to the London Eye?
A. Takiing no items on boare
B. Arriving at the spot by tube
Cooking tickets online in advance.
D Being accompanied by a family member.