I set up email addresses for connecting with my parents last May. But I didn’t write to them as often as I ______.
| A．should | B．must have | C．should have | D．must |
Loulan, once a small, wealthy commercial city, is believed by many people___________over gradually by sandstorms from AD 200 to AD 500.
| A．covered | B．was covered | C．to be covered | D．to have been covered |
The blind man thought___________necessary to pay back the help people gave him when it was sunny.
| A．that | B．it | C．this | D．him |
.The Chinese language differs from many Western languages___________it uses characters which have meanings and can stand alone as words.
| A．unless | B．until | C．now that | D．in that |
.Don’t be frightened by sharks as there is___________chance of being hit by lightning than being attacked by a shark.
| A．as thirty times great as | B．as thirty times great |
| C．thirty times as great | D．thirty times greater |
.Polly found herself_________ up at a man_________with his hand___________on her arm.
| A．staring; standing; resting | B．stared; stood; rested |
| C．stare; stood; rested | D．to stare; standing; resting |