The most important thing about cotton in history is ______part that it played in ______ Industrial Revolution.
| A．不填；不填 | B．the; 不填 | C．the; the | D．a; the |
______ a pair of compasses, it is easy to describe a circle.
| A．Having | B．To have had | C．If you have | D．If having |
---Does your brother serve in the army?
---No, not now. But he ________ in the army for 8 years.
| A．would serve | B．was serving | C．had served | D．served |
Everyone in our class works as hard as they can ________ to enter a good college.
| A．to hope | B．hope | C．hoping | D．hoped |
He pointed to ______ looked like a tomb and said, “Ghost.”
| A．that | B．what | C．which | D．as |
The operation is _____ success and the patient is now out of _____ danger.
| A．a, the | B．a, / | C．/, the | D．/，/ |