It was ordered that all the soldiers ____ to the front．
| A．should send | B．must be sent | C．be sent | D．must go |
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 |
He failed in the exam, ____ proves that he wasn’t working hard enough.
| A．which | B．what | C．it | D．that |
During the week ____ he tried to collect materials for his article.
| A．following | B．followed | C．to follow | D．that followed |