_____ relation between China and Russia has developed steadily since Vladimir Putin was re-elected ________ president last May.
| A.The; the | B.a; the | C.The; 不填 | D.A; 不填 | 
The price of diamond rings has risen sharply _______ the price of gold rings has gone down.
| A.when | B.as | C.while | D.otherwise | 
It is a long time since I last saw you . This sentence means _______
| A.I had seen you for a long time | B.I have seen you for a long time | 
| C.I haven’t seen you for a long time | D.I saw you again before long | 
_______ reason you may give , you ought not to have left homework unfinished.
| A.What | B.No matter | C.However | D.Whatever | 
It seemed only several minutes _______ he finished this painting .
| A.after | B.before | C.when | D.until | 
I’ll lend you my car _______ you return it intact.
| A.so far as | B.as long as | C.unless | D.until |