I don’t doubt ____________ she can do it well, but I doubt _________ she is willing to do it.
| A．that; if | B．that; that | C．if; if | D．if; that |
A lot of trees ______ in the country every year．
| A．was cut down | B．cut down |
| C．are cut down | D．will cut down |
_____ he is only 4 years old，he is able to play the piano very well．
| A．if | B．although | C．unless | D．until |
Working hard ________ the key _________ success of everything．
| A．is,to | B．is,of | C．are,in | D．are,for |
We feel like ___________ the work as soon as possible．
| A．finish | B．to finish | C．finishing | D．finished |
The old man lives _______ in the countryside, but he didn’t feel __________．
| A．lonely；alone | B．alone；lonely |
| C．alone；alone | D．lonely；lonely |