The global warming is more and more serious，for which human beings ________.
| A．are blaming | B．are to blame |
| C．are going to blame | D．are to be blamed |
The CDs are on sale! Buy one and you get completely free.
| A．other | B．others | C．one | D．ones |
When he the door, he found his keys were nowhere.
| A．would open | B．opened | C．had opened | D．was to open |
–I am so sorry to have come late for the meeting.
-It’s not your fault. With rush-hour traffic and heavy rain, it is no wonder you were late.
| A．a; a | B．the; the | C．/; / | D．/; a |
With April 18’s railway speedup, highway and air transport will have competed with service for passengers.
| A．good | B．better | C．best | D．the best |
The art show was being a failure; it was a great success.
| A．far from | B．along with | C．next to | D．regardless of |