—He has a lot of friends who have a lot in ________ common with himself.
—Indeed.Birds of ________ feather flock together.
| A．the; / | B．the; a | C．/; a | D．a; the |
He returned home safe and sound after a fierce battle, ____ was unexpected.
| A．which | B．as | C．that | D．it |
____ we is known to all, English is not very difficult to learn.
| A．What | B．As | C．That | D．Which |
The old man had three sons, all of ____ died during World War Ⅱ.
| A．whose | B．that | C．whom | D．who |
I have bought two pens, ____ write well.
| A．none of which | B．neither of which | C．both of which | D．all of which |
Do you know the reason ____ she has changed her mind?
| A．why | B．which | C．for that | D．of which |