______ their homework, these three students have to stay in the classroom for another thirty minutes.
| A．Not finishing | B．Not finished |
| C．Having not finished | D．Not having finished |
It doesn’t _____ to set off fireworks on holidays since the smog(雾霾) is so severe at present.
| A．make a difference | B．make sense | C．make progress | D．make a choice |
Two years ago, she bought an expensive mountain bike and then she persuaded me to buy _______.
| A．this | B．that | C．it | D．one |
He is such ____ social failure that many colleagues don’t like him.
| A．the | B．an | C．a | D．不填 |
—Are you here on business?
—No, _____. This is my holiday.
| A．for pleasure |
B．with pleasure | C．a pleasure | D．It’s my pleasure |
The door opened and in_______.
| A．he came | B．came he | C．did he come | D．he come |