Between 4.5 and 3.8 billion years ago, the earth became so ______ that it was not clear whether the shape would last or not.
| A．genuine | B．slight | C．solid | D．violent |
29. _____ a girl’s brain is better organized to send and receive speech, we generally talk to them more.
| A．Although | B．Since | C．For | D．When |
28. This morning Ms. Green entered our classroom, and _____ us something important about the coming exam, left.
| A．having told | B．told | C．telling | D．to tell |
27. The SAT is an excellent means of testing students. _____, it shouldn’t be only one of the many methods used.
| A．Therefore | B．And | C．However | D．Besides |
26. The drivers _____ about who was to blame for the crash for over 2 hours when the police arrived on the scene.
| A．have been arguing | B．were arguing | C．argued | D．had been arguing |
25. There are also those _____ hunting in fact offers a chance to prove themselves and risk death on purpose.
| A．who | B．from whom | C．/ | D．for whom |