If you want to study the nature of the universe, first of all, you must be clear about its ________.
| A．traditions | B．consequences | C．signs | D．origins |
The quarrel________to the fight started from their disbelief in each other.
| A．led | B．to lead |
| C．leading | D．has led |
(2013·皖南八校三次联考)Launched in March 2010，ChinaFace has been a daily news feature________on a Chinese individual.
| A．being focused | B．focusing |
| C．to be focused | D．to focus |
—Shall I help you with the math problem?
—________.
| A．If you wish | B．With pleasure |
| C．You’re welcome | D．That’s right |
________ Yao Ming has retired from the NBA，the pleasure we have got by watching him play basketball at home and abroad will last long.
| A．Although | B．If |
| C．Since | D．Once |
________they decide which college to go to，students should research the admission procedures.
| A．As | B．While |
| C．Until | D．Once |