At first driving requires a lot of concentration, but over time, it just becomes_____.
| A．authentic | B．available | C．automatic | D．awake |
The ____________ engineer had planned to design the blueprint the way no one else had ever done.
| A．main | B．chief | C．major | D．total |
The __________ aim of the air raid was the complete destruction of all means of communications by bombing.
| A．most | B．mostly | C．major | D．majority |
_________________ and out of breath, we reached the top of the mountain and stopped __________ the beautiful scenery.
| A．Tiring, to admire | B．Being tired, admiring |
| C．Tired, to admire | D．Tired, admiring |
I greeted the teacher with ‘ hello”, and the teacher gave me a sweet smile _________________.
| A．by turns | B．in return | C．in turn | D．for turn |
Do you know the trouble he had ______________ the work?
| A．on finishing | B．to finish | C．having finishing | D．finishing |