_____ the police thought he was the most likely one, they could not arrest him since they had no exact proof about it. 
| A．Although | B．As long as | C．If only | D．As soon as |
______ any change about the date，please tell me immediately.
| A．Will there be | B．Should there be | C．There will be | D．There should be |
It is not known yet how these huge stones were __________over a distance of 380 kilometers.
| A．removed | B．transformed | C．transmitted | D．conveyed |
People wrote letters to get in touch in the past. Nowadays email has the way people communicate.
| A．directed | B．conveyed | C．transformed | D．sponsored |
In recent years, China and the USA have had a lot of ___________of views about the same problem.
| A．replacements | B．transformations | C．changes | D．exchanges |
They are not familiar with the project, so I don’t think amounts to（意味着） much.
| A．what did they say | B．what have they said | C．whatever have they said | D．whatever they say |