It’s easy to make friends, but it’s difficult to keep the ________ longer.
If you _______ , I will _______ myself.
-- Can I join their club?-- I am afraid you will be refused __________ you’ve passed all their tests.
He fell off the bike ________.
My sister isn’t in. ________ she comes back, I’ll let her call you back.
She got up early this morning _________ she could catch the first bus.