Kate, run a bit faster, ____ you can catch up with all of your classmates.
It is the test system, _____ the teachers, that is to blame for the heavy burden of middle school students nowadays.
______ not to miss the flight at 15:20, the manager set out for the airport in a hurry.
The last letter ____ arrived yesterday morning left him______ very sad.
There is nothing to get________ about for it is common in our daily life.
____ anyone phone during the board meeting, please tell them I am busy.