Little ________ that we were watching his every move，so he seemed to be going his own way in this business.
| A．he realized | B．he didn't realize |
| C．didn't he realize | D．did he realize |
After a talk with his mother, the little boy has seen to _____ that the same mistake doesn’t happen again.
| A．one | B．it | C．him | D．himself |
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 |