We __________ that the two substances have combined to form the new material.
| A．suggest | B．conclude | C．concentrate | D．include |
We were very tired and walked with difficulty，but we got home ______.
| A．at all | B．after all |
| C．above all | D．in all |
I can't give my son the leading position.______，he is too young；secondly，I want Mr.Smith to have the job.
| A．After all | B．For example | C．In the end | D．To begin with |
Many people in China have never dreamed of ______ a chance for them to learn to drive after their retirement.
| A．being | B．there | C．there to be | D．there being |
Tom pretended ______ it；but in fact，he knew it very well.
| A．not to listen to |
| B．not to hear about |
| C．not to have heard about |
| D．not to be listening to |
The country has acknowledged ______ every means to fight against any possible attack.
| A．to have taken | B．have taken | C．to having taken | D．having taken |