—Allan looks tired out.
—Sure. He in the gym for two hours.
| A．works out | B．had worked out |
| C．has been working out | D．was working out |
The question occurred to me ______ we were to get the machine needed.
| A．that | B．what | C．why | D．where |
— Was her concert a great success?
— Sure. _______ such a good chance, how could she let it slip away?
| A．Having given | B．Giving |
| C．Having been given | D．Being given |
______is now no doubt ________ global warming is a security threat to us all.
| A．It; that | B．There; that | C．There; whether | D．It; whether |
The doctors say that good diet, exercise and fresh air, all of which _____ the health and long life.
| A．lead to | B．refer to | C．stick to | D．contribute to |
On farewell party the foreign teacher gratefully_____ all the helps from all the school.
| A．thank | B．acknowledge | C．claim | D．declare |