The college entrance exam is ____ important to the student, and it’s also challenging.

I’ll join the music club ________ Mtoo.

Qinghai-Tibet Railway(青藏铁路) was comple­ted last year.It is the __________ railway that connects Tibet with the other parts of China.

MrHu, have you finished correcting the papers?—Not yet, the papers _______You _______ get the results from me by tomorrow

I’m wondering whether the police have _____ a warning to people living in this area after several robberies.