_________ the progress of science and technology, the discomfort of old age will no doubt always be with us.
We should know that we can only reach the top if we are ready to ____ and learn from failure.
——This wall of air is an effective answer to the problem and it ____ work. ——But it is a question to put such a wall of air around the statue.
——The dinner was delicious! ——I agree. I am so full. ——That’s too bad. But some dessert ____.
In some countries, _______ are called “public schools” are not owned by the state.
“How long do you suppose it is _______ he left for Japan?” “No more than half a month.”