_____ three influenza type A virus subtypes（子类型） have been found in pigs．
| A．By far | B．As far as | C．So far | D．Till far |
Was it because of the heavy snowstorm in Europe _______ the flight had to be put off ?
| A．which | B．so | C．why | D．that |
Not until the taxi disappeared in the distanceher handbag was gone.
| A．Tina had found | B．had Tina found | C．did Tina find | D．Tina found |
It is one thing to enjoy listening to good music, but it isanother to play it well yourself.
| A．quite | B．very | C．rather | D．much |
Tsinghua University, in 1911, is home to a great number of outstanding figures.
| A．found | B．founding | C．founded | D．to be founded |
He had a burning ________ to win back the teacher’ s confidence in him.
| A．desire | B．feeling | C．emotion | D．impression |