To save the drowning child, the boy plunged into the icy water without hesitation, ____ his own safety.
| A．despite of | B．regardless of | C．unaware of | D．because of |
The teacher frowned ___ annoyance when a student fell asleep during his lesson.
| A．at | B．to | C．with | D．for |
Hearing the sound, the animal disappeared into the bushes, ___ Mrs. Stone picked up her bag and ran all the way home.
| A．after that | B．after what | C．after which | D．after when |
Sorry to have kept you waiting. You must have thought ___.
| A．we are not coming | B．we were not coming |
| C．we did not come | D．we were not come |
____, I had to buy a new one.
| A．My dictionary losing | B．My dictionary having been lost |
| C．Because my dictionary lost | D．My dictionary had been lost |
I have been studying computer for years and I still ___.
| A．have | B．do | C．have been | D．am |