We should do what we can ______ people’s hard work pays off.

I can hardly remember any occasions ____ I get caughtin a traffic jam in our town．

Only when senior high schoolto show a greatinterest in poems.

Most of the students got a favourable impression________the new teacher，and they were especially impressed________his humour and broad knowledge

He is one of the most excellent students in our class, and he always _____ himself in his studies.