He stood there for two hours ____ the game. 

Is it always easier ____ friends than to keep them? 

They were made ____ fourteen hours a day. 

Why not ____?

The headmaster’s words are quite _____.

--Do you often hear John ___ in his room?  --Yes. Listen! Now we can hear him ___ in his room.

The scientist suggested ____ the experiment in a different way. 

It’s bad for your eyes ____ computer games for a long time. 

A policeman saw two thieves ____ a girl’s mobile phone on a bus and he caught them at once.

----Lily, keep the window ____. The sandstorm hasn’t stopped yet. ----OK, I’ll do that.