Choose and fill.（选词填空）
(Whose, longer, runs, Who, better, good)
1. Who sings _________ than Tim?
2. Are you ______ at it?
3. _________ ruler is long?
4. Whose hair is ____________ than Lily’s?
5. Amy ____________ faster than Lily.
6. _________ is shorter than Lily?

Nowadays pollution is than before. （    ）

A．serious

B．seriously

C．more serious

D．more seriously

People want to make the country ____.（  ）

A．green

B．dark

C．greener

D．polluted

Singapore Flyer is the world’s ______ flyer. (   )

A．largest

B．larger

C．large

The Great Wall is ________ of all in the world. (   )

A．the longest

B．longest

C．the tallest

D．the longer