The tickets for the show have all been sold out. In other words, the tickets are not ____ now.
Bob would have helped us yesterday, but he_______
Green products are becoming more and more popular because they are environmentally_______.
Heavy rainstorm broke out in South China,68 lives and 62 still missing.
Dr. Smith, together with his wife and daughters , visit Beijing this summer. A is going to B are going to C was going to D were going to
The experiment shows that proper amounts of exercise, if regularly, can improve our health.