.An air France jet is reported________in the Atlantic Ocean with 228 people aboard，the airline’s worst disaster in its 75-year history．
| A．to have crashed | B．to have been crashed |
| C．having crashed | D．having been crashed |
Shall I lock the lab before I go home?
__________. I’ll check it myself later.
| A．Go ahead | B．No problem | C．No hurry | D．Don’t bother. |
Don’t laugh at people who are ______.
| A．in troubles | B．in a trouble |
| C．in trouble | D．in many troubles |
He worked hard, ______ he passed the exam.
| A．in a result | B．as result | C．as a result | D．for a result |
Mr. Brown knows little Japanese, so he can’t understand the ______ on the bottle of the pills.
| A．explanations | B．introductions | C．descriptions | D．instructions |
Travelling in space has been made __________ possible with the development of science and technology.
| A．that | B．/ | C．it | D．this |