As high school students, it’s very important to keep ourselves ______ of what’s happening home and abroad every day.
There were some chairs left over ________ everyone had sat down.
—Are you ready for Spain?—Yes,I want the girls to experience that ________ they are young.
We'll have a picnic in the park this Sunday ________ it rains or it's very cold.
I'm sorry you've been waiting so long,but it'll still be some time ________ Brian gets back.
—Did you return Fred's call?—I didn't need to ________ I'll see him tomorrow.