How ______ universe came into being is a puzzle to ______ scientists of all generations.
A. the; 不填 B. an; the C. a; 不填 C. 不填；the
______ he did not want to, he still had to share his hotel room with a stranger.
| A．Because | B．Even though | C．When | D．As if |
We haven't discussed yet _______ we are going to place our new furniture.
| A．that | B．which | C．what | D．where |
______, he always makes time for his family.
A. No matter he is busy B. No matter how busy he is
C. However he is busy C. However busy is he
--- Now the situation has been kept under ______ control.
--- Yes. ______ role John played in it was very important.
| A．the; A | B．/; The | C．the; The | D．/; A |
______ reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced.
| A．With | B．In | C．About | D．Upon |