There were some chairs left over ________ everyone had sat down.
A．when B．until C．that D．where
—Are you ready for Spain?
—Yes，I want the girls to experience that ________ they are young.
A．while B．until C．if D．before
We'll have a picnic in the park this Sunday ________ it rains or it's very cold.
A．since B．if C．unless D．until
I'm sorry you've been waiting so long，but it'll still be some time ________ Brian gets back.
A．before B．since C．till D．after
—Did you return Fred's call?
—I didn't need to ________ I'll see him tomorrow.
A．though B．unless C．when D．because
A small car is big enough for a family of three ________ you need more space for baggage.
A．once B．because C．if D．unless
