If you ____ the chat room ten minutes ago, you ____ what we were talking about.
| A．have joined; will know | B．would join; have known |
| C．should join; would know | D．had joined; would have known |
Leonardo da Vinci (1452-1519) ____ birds kept in cages in order to have the pleasure of setting them free.
| A．is said to be buying | B．is said to have bought |
| C．had said to buy | D．has sad to have bought |
They paid fifty percent of _____ they were able to earn to the state．
| A．that | B．which | C．what | D．whom |
My sister is _______ about what she eats, otherwise she would not be so thin.
| A．special | B．curious | C．particular | D．specific |
I know a little bit about the city as I __________ there for one year in my youth.
| A．am studying | B．had studied | C．studied | D．have studied |
While working in the countryside, the students a great deal of knowledge on plant life.
| A．looked up | B．picked up | C．put up | D．called up |