I don’t know if she _____, but if she ____ I will let you know.
| A．comes, comes | B．will come, will come |
| C．comes, will come | D．will come, comes |
Up to now, no one has come up with a（n）explanation of why dinosaurs died out, and it remains a mystery．
| A．astonishing | B．amusing | C．convincing | D．puzzling |
All the cloned animals have so far suffered from some serious disorders, many ofdying soon after birth．
| A．that | B．whom | C．which | D．them ． |
Your IQ isn’t _____determines whether you will succeed in your future life.
| A．what | B．where | C．that | D．why |
Housing prices _____much higher now if the government hadn’t taken measures to control house dealing.
| A．were | B．would be | C．had been | D．would have been |
______ difficulty, you can reach me at this number. I’m always at your service.
| A．In favor of | B．In terms of | C．In case of | D．In spite of |