______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.
One of the most important problems we will have to solve is _______ of students’ learning method.
. The house is nice, but ______ too small for a family of five.
______ from what he said, he must be the thief who has stolen the car.
. They were surprised that a child could work out the problem ______ they themselves couldn’t.
. --- I hear Jane has gone to the Holy Island for her holiday. --- Oh, how nice! Do you know when she ______ ?