27. In the absence ____ necessary exercise, he can get ill easily. So he is often absent ___ class.
Helen always helps her even though going to school ________ most of her day.
The policeman came up to the house, whose door was open, ________ there for a while, and went in.
—Too noisy outside! I just can’t focus on my study.—______. Let’s go outside and play soccer instead.
To my delight, the students are recycling many things they ______ away in the past.
Sue is always finishing her task well within the shortest time. ______, she performs effectively.