I can never forget the days _____ we worked together and the days ______ we spent happily together.
| A．when; which | B．which; when | C．for which; that | D．on which; when |
.China is one of the largest countries in the world, _______ 9.6 million square (平方) kilometers.
| A．to cover | B．covered | C．covers | D．covering |
We advised them to take a rest, but they insisted _______ the work.
| A．finish | B．to finish | C．in finishing | D．on finishing |
I delayed _______ your letter because I had been away for a week.
| A．answer | B．answering | C．writing | D．to post |
.If he succeeded _______ a job, his children wouldn't be suffering from hunger now.
| A．to find | B．to look for | C．in finding | D．in looking for |
I still remember _______ to my home town when I was young.
| A．taking | B．taken | C．being taken | D．to take |