______ scientists have learned a lot about the universe, there is much we still don't know.
| A．Once | B．Since | C．Though | D．Unless |
Is this the way ____ you do it?
| A．which | B．in that | C．/ | D．that |
– Have you moved in the new house?
– Not yet, the rooms ____.
| A．are being painted | B．are painting | C．are painted | D．are being painting |
Do you know the man ____ my teacher just shook hands?
| A．to whom | B．whom | C．whose | D．with whom |
I should like to buy a house, modern, comfortable and ____, in a quiet place.
| A．first of all | B．after all | C．in all | D．above all |
New York is a nice old city, ____ I visited last summer.
| A．that | B．where | C．which | D．as |