－Jeffery seems to go without proper food and sleep for days.
－Leave him alone.That's________he reacts to a lost love.
| A．what | B．how |
| C．why | D．when |
As fuel prices rose, Taxi companies raised their fares and ___．
| A．so did the airlines | B．nor did the airlines |
| C．so the airlines did | D．nor the airlines did |
British scientists have produced ___ they believe is the world's smallest Christmas card．
| A．which | B．who | C．that | D．what |
The big fire in Shanghai, believed to ___ due to the burning of construction materials, caused 58 deaths and destroyed all the belongings of the people there．
| A．have occurred | B．occur |
| C．have been occurring | D．be occurring |
A teacher's ___ to education is worth great respect of the whole society because it brings benefits to the development of society．
| A．devotion | B．principle | C．identity | D．guidance |
—What do you think of the American singer Lady Gaga?
—Too crazy, but if she ___ come to China to hold concerts, I would buy tickets for her live show．
| A．would | B．could | C．should | D．might |