.Being examined twice a year is the rule that every driver obey in the city .
| A．shall | B．can | C．ought to | D．need |
______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.
| A．To attach | B．Attach |
| C．Attached | D．Having attached |
With ________ word “PM 2.5” repeatedly appearing in ________ media reports, the public can’t help wondering what it really means.
| A．the; \ | B．a; the |
| C．the; the | D．\; the |
We have just heard a warning on the radio _____________ a typhoon may be on its way．
| A．what | B．when | C．which | D．that |
I will spend half of my holiday practicing English and _____________ half learning drawing．
| A．another | B．the other |
| C．others | D．other |
I ______________ have passed my examination easily，but I made too many stupid mistakes．
| A．must | B．will | C．shall | D．could |