. It used to be thought _____ the Earth was flat.
| A．as | B．when | C．since | D．that |
Turn on the television or open a magazine and you ________ advertisements showing happy families.
| A．will often see | B．often see |
| C．are often seeing | D．have often seen |
The detective, ________ to read a newspaper, glanced at the man ________ next to a woman.
| A．pretending; seat | B．pretending; seated | C．pretended; seat | D．pretended; seated |
At first, they worried about the situation but things ______quite well.
| A．went on | B．carried on | C．worked out | D．tried on |
Only when our country has aircraft carriers _______ our distant islands more effectively.
| A．we can guard | B．can we guard | C．we guard | D．do we guard |
Maria is fond of all kinds of sports, but she likes swimming ________.
| A．in practice | B．in general | C．in fact | D．in particular |