—Hi, Dave! What’s up?—Oh, _____. What are you doing recently, Cathy?—Chatting online a lot with friends.
Not until the train pulled into the next station ________ her suitcase gone.
He hurried to the booking office only ______ that all the tickets had been sold out.
The problem lies_______ we are now giving him a fish, not teaching him to fish.
When ____ comes to saving energy, big changes start with small steps, like turning off the lights.
Of the two cameras, I would prefer ________ one, which is very easy for me to carry.