Students in Dingli Senior High School are walking along the street, _____ a small red flag.

______________________, he had to walk home at midnight.

With so many orphans ________，the charity organization calls for more donations.

 With the second ring road overpass _______ at present in Chengdu, the local citizens have to     choose another way to avoid traffic jam.

With the entrance examination _____ up, our classmates work harder and harder.