_______ their service, the workers of the hotel are active in learning English.
| A．Improving | B．To improve |
| C．Improve | D．Having improved |
30．Written in a hurry .
| A．they find many mistakes in the report |
| B．the report is full of spelling mistakes |
| C．Sam made many mistakes in the report |
| D．There are lots of mistakes in the report |
29．—May I speak to your manager at three o’clock tomorrow afternoon ?
—I’m sorry, He to Shanghai by then
| A．had flown | B．could have flown |
| C．will have flown | D．has flown |
28．The Chinese people are looking forward to the first attempt on the moon after Yang Liavei’s successful trip into space.
| A．landing | B．landed | C．land | D．to land |
27．—Does the new teaching method work ?
— Yes, The students find it easier towhat is being taught.
| A．take in | B．take off | C．take up | D．take on |
26．The chemical weapons by the Japanese troops are the chief cause of the constant poisoning accidents.
| A．Were abandoned | B．abandoned | C．had abandoned | D．abandoning |