His father, who is said to be teaching in Australia, ____ in Nanjing University for more than 10 years.
| A．has worked | B．had worked | C．worked | D．has been working |
She was more headstrong than ______.
| A．the rest of us | B．us the rest |
| C．the other of us | D．us the other |
Though ______, many laws of nature exist.
| A．not having been discovered | B．having not been discovered |
| C．not having discovered | D．having not discovered |
The servant did _____ she could ______ the revolutionary.
| A．what, help | B．that, to help | C．what, to help | D．all help |
The missing boys were last seen _____ near the river.
| A．playing | B．to be playing | C．play | D．to play |
He gave me the phone number in order ______ contact him when we are in need of help.
| A．to | B．of me to | C．for me to | D．that I |