The question under discussion here is ______ of the "white pollution".
| A．that | B．which | C．one | D．it |
.
We tried hard, and eventually, we were able to get Mike ____us his car just for a day.
| A．lending | B．lend | C．to lend | D．lent |
.
Susan started to clean the room; __________Lily was preparing lunch.
| A．however | B．but | C．meanwhile | D．when |
.
Had you joined the caht room ten minutes ago, you would have known what we _______about then.
| A．had talked | B．have talked | C．talk | D．were talking |
.
.It is too bad for someone in such a high _______ in the government to behave badly in public.
| A．position | B．situation | C．profession | D．condition |
.
----Why are your hands so dirty?
----I ____________in the garden.
| A．was working | B．have worked | C．worked | D．have been working |