50. The Englishman has a very good ear _____ music. You can ask him for some advice.
| A．at | B．of | C．for | D．In |
My mother made a promise _______I passed the examination, she would buy me an MP4.
| A．that | B．that if | C．if that | D．whether |
_______ in the city for thirty years, the old man moved back to the countryside.
| A．Having worked | B．Working | C．To have worked | D．To work |
The woman scientist was so busy that she could hardly_______ time to her children.
| A．spend | B．devote | C．offer | D．provide |
On Feb. 6, Xi’an – Zhenzhou High – Speed Railway,_________first high – speed railway in_______West China, was put into operation.
| A．不填；the | B．the; the | C．the; 不填 | D．不填；不填 |
______ you are alone at home, why don’t you go with us to the party?
| A．Even though | B．As though | C．So that | D．Now that |