The camera________in 1827 by Joseph Nicephore Niepce．
| A．invented |
| B．is invented |
| C．was invented |
| D．is inventing |
It’s ______ today than it was yesterday.
| A．much foggy | B．foggy | C．more foggier | D．much foggier |
Hurry up! The filmfor ten minutes.
| A．was on | B．started | C．has been on | D．has started |
The woman was in that hotel before she came here.
| A．on service | B．on the service |
| C．in service | D．in the service |
When ___you _____ your breakfast this morning? At 6.00.
| A．have, had | B．did, have | C．are, have | D．has, had |
The twins has studied in this school .
| A．two years ago | B．since two years ago |
| C．for two years ago | D．since two years |