The students are working hard their studies .
| A．to | B．in | C．on | D．for |
There are days in a week .
| A．five | B．six | C．seven | D．eight |
August , we have our summer holiday .
| A．In | B．On | C．At | D．/ |
Let’s play basketball after school .
| A．a | B．an | C．the | D．不填 |
January is the month of the year .
| A．first | B．second | C．third | D．fourth |