—Look, where are you going!
—Sorry, I _______.
| A．wasn’t noticing | B．didn’t notice |
| C．haven’t noticed | D．am not noticing |
To his disappointment, not a single gift _____ on his birthday.
| A．he received | B．had he received | C．did he receive | D．received he |
Most Australians actually don’t seem to do much sport. _____, Australia is generally considered to be a great sporting nation.
| A．Though | B．Still | C．Otherwise | D．Thus |
Professor Smith will come here to give a speech. All the preparations must be _____ before 5 o’clock.
| A．in time | B．in sight | C．in place | D．in control |
---Is everything settled?
---Not yet. _____ I approached the problem, I couldn’t find a solution.
| A．Whatever | B．However | C．Whenever | D．Wherever |
The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health.
| A．involved | B．being involved | C．having involved | D．to be involved |