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
The weather was ________ cold that I didn't like to leave my room.
A．really B．such C．too D．so
—Have you got any idea for the summer vacation?
—I don't mind where we go ________ there's sun，sea and beach.
A．as if B．as long as
C．now that D．in order that
