Qinghai-TibetRailway(青藏铁路) wascomple­ted last year. It is the __________ railway that connects Tibet with theother parts of China.

The music often makes me ________ of my oldfriends.

These problems, ________, will seriously affect the growth of teenagers and even the nation’s future.

He was crazy ______ his study when he was young, which contributes ______ his success in later life

Mum, we must have the computer_______. I want to send an e-mail to my friend.- OK. I’ll ask Uncle Li_______ it this afternoon.