On snowy days, you have to drive very ________ to avoid traffic accident.

—Could you tell Jerry the manager is wanting him when you see him? —Sure, I will _______ I see him.

 He said it was _____ impossible to buy the novel which was _____ worth reading.

We haven’t heard from her for long, so we give her_____for dead.

－In what way will you use your portable computer? －I’ll use it ______ for giving lectures at conferences at home and abroad.