Every means ______ tried but without any result.
| A．have been | B．is to be | C．are to be | D．has been |
The sale usually takes place outside the house ，with the audience on benches，______chairs or boxes。
| A．having seated | B．to seat | C．seated | D．seating |
We still remember once__________round the famous tower when we were young.
| A．having taken | B．to be taken |
| C．having been taken | D．to have taken |
— Marx looks nervous.
— So____________you if you had so fierce a competition.
| A．do | B．did | C．will | D．would |
________ good use you have made of your time to work, there is still some room for improvement.
| A．Whatever | B．However | C．Though | D．Whether |
It was the quality of life in the futureI took this training course，not just to make more money.
| A．to improve; that | B．improving; when | C．to improve; when | D．improving; that |