It won’t be a very long time _________ he is in business for himself.
| A．until | B．when | C．before | D．that |
Alexander Graham Bell invented＿＿＿＿＿telephone in1876．
| A．／ | B．a | C．the | D．one |
Beyond＿＿＿＿＿stars, the astronaut saw nothing but＿＿＿＿＿space．
| A．the；／ | B．／； the | C．／；／ | D．the； the |
Alice is fond of playing＿＿＿piano while Henry is interested in listening to＿＿＿music．
| A．／； the | B．／；／ | C．the；／ | D．the； the |
＿＿＿＿＿danger man is often much wiser than usual．
| A．In a time of | B．In the times of | C．In the time of | D．In time of |
Father went to his doctor for＿＿＿＿＿about his heart trouble．
| A．an advice | B．advice | C．advices | D．the advices |