The police tried to get some clues from the suspect, but he remained ______．
| A．silent | B．quiet | C．calm | D．still |
He asked a lot of questions, and none of ______ was easy to answer.
| A．them | B．which | C．what | D．that |
He told me that he had two girl-friends, neither of _______ knew anything about the other.
| A．whom | B．them | C．which | D．who |
He told me that he had two girl-friends, and neither of _______ knew anything about the other.
| A．them | B．whom | C．which | D．who |
All of the flowers now raised here have developed from those _____ in the forest.
| A．once they grew | B．they grew once | C．that once grew | D．once grew |
The modern history of Italy dates from 1860, ______ the country became united.
| A．when | B．if | C．since | D．until |