The school has developed an online system________ students can choose their own teachers.
| A．which | B．when | C．that | D．where |
______ twice, the postman refused to deliver our letters unless we chained our dog.
| A．Being bitten | B．Bitten | C．Having bitten | D．To be bitten |
Though ______ money, his parents managed to send him to university.
| A．lacked | B．lacking of | C．lacking | D．lacked in |
Now that we’ve discussed our problem, are people happy with the decisions______?
| A．taking | B．take | C．taken | D．to take |
We had three sets of garden tools and we seemed to have no use for _________.
| A．none | B．either | C．any | D．each |
—Alice, why didn’t you come yesterday?
— I________, but I had an unexpected visitor.
| A．had | B．would | C．was going to | D．did |