He found_ ________very difficult ________the math problem．
| A．that, to solve | B．this, solving |
| C．it, to solve | D．it, solving |
My brother often forgets _________ the windows, but he remembered __________ them when he left yesterday.
| A．closing, close | B．to close, close | C．closing, to close | D．to close, closing |
--- Oh, there is someone knocking at the door.
--- __________ must be your neighbour, Mrs Black.
| A．There | B．She | C．He | D．It |
We will have a party ________ the evening of New Year’s Day.
| A．in | B．on | C．at | D．of |
It’s not right ________others’ homework.
| A．copy | B．copying | C．to copy | D．copies |
What ________when we were in the barber shop?
| A．happened | B．was happened | C．happening | D．would happen |