-- Do you think it's a good idea to make friends with your students?-- ______, I do. I think it's a great idea.

 The repair work may take us a long time，but          it’s worth trying.

After two years' research，we now have a ________ better understanding of the disease.(2013·全国Ⅱ)

 I thought she was African, but ______ she’s Spanish.

--It’s reported that young people are responsible for 60% of the traffic accidents.---Exactly. Young drivers are far more _______ to drive faster than old ones.