Cars, buses and bikes ________ stop when the traffic lights turn red.
| A．can | B．may | C．must | D．need |
The shop owner welcomed all the guests with a __________ smile.
| A．practice | B．practise | C．practical | D．practiced |
To my ______, I passed the exam easily.
| A．joy | B．joyful | C．joyless | D．joyness |
____ speaking, I didn’t do it on purpose.
| A．Honestly | B．Honest | C．Honesty | D．Dishonest |
It sounds like a good plan, but there are some _____ difficulties in carrying it out.
| A．practiced | B．practical | C．practice | D．practicing |
His father possesses a __________ factory, which does most of the pollution to this river.
| A．paper-make | B．paper-making | C．papers-made | D．paper-made |