－He looks as if he the answer．

－He has________．

A．has known

B．knows

C．had known

D．knew

The badly wounded soldier slowly opened his lips as if ________ something．

A．to say

B．said

C．he had said

D．was saying

Eliza remembers everything exactly as if it ________ yesterday．

A．was happening

B．happens

C．has happened

D．happened

When a pencil is partly in a glass of water, it looks as if ________．

A．breaks

B．has broken

C．were broken

D．had broken

He hurried to the book office only ________ that all the tickets has been sold out．

A．to tell

B．to be told

C．telling

D．told

________ the safety of gas, the government has checked the city’s gas supply system thoroughly．

A．To ensure

B．Ensuring

C．Having ensured

D．To have ensured

________ the development of its economy, the world’s attention is once again ________ upon ________ is called the East Asia．

A．With; fixing; that

B．With; fixed; what

C．As; fixed; what

D．As; fixing; that

Don’t you know that Australia was as a matter of fact ________ used to be a nation of prisoners?

A．where

B．what

C．which

D．that

By improving reading skills, you can read faster and understand more of ________ you read．

A．that

B．what

C．which

D．whether

Don’t leave the water ________ while you brush your teeth．

A．run

B．running

C．being run

D．to run