1.( ) he knows,he still needs to learn
a .as much b,though c much as d since
2.-I'll be waiting for you at home .
- ( ) I were busy and couldn't come?
a .what if b .what when c how if d how when
在加一题：Parks are to the city ( )lungs to the body．
a ． as b． what c． as if d． look like
第一题选C阿。