Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.(2011·江西)
With more forests being destroyed,huge quantities of good earth ________ each year.
One of our rules is that every student wear school uniform while at school.
The sooner we students ________to the new school,the better it will be ________our studies.
----You seem to be burning yourself out with the coming exam!—--________. I'm dying for a thorough rest and a good workout.
-----Do you regret having quit your job?----Why should I? I ________ as much ,but I really enjoy the present one.