Many people _____ the opening ceremony of 2010 World Expo, which was so amazing.
| A．witnessed | B．participated | C．swallowed | D．handled |
．What I like about Harvard isthere’s the old classical look—there are parks and traditional buildings.
| A．why | B．where | C．that | D．how |
With a lot of tough problems, the pilot was still calm, cool and collective under pressure.
| A．solve | B．solved | C．solving | D．to solve |
left the door unlocked must be held responsible for the accident.
| A．Whomever | B．Whoever | C．Whatever | D．Whenever |
If we use the new recycling method, a large number of trees.
| A．are saved | B．will save | C．will be saved | D．have saved |
．She is fed up with sharing a house with others; , she is looking for her own flat.
| A．moreover | B．otherwise | C．however | D．therefore |