–Hi, Tina, we’re going to Sam’s house to celebrate his graduation, would you like to _________? --Great! Let’s go.
Stop making noise, _______ the neighbors will start complaining.
Many students go to school _______ the tube in Beijing every day.
It was two weeks before the Spring Festival and the shopping centre was _____ with shoppers.
Leave your key with a neighbor _____you lock yourself out one day.
—Bob has gone to California. —Oh, can you tell me when he ______?