________in thought, he almost ran into a passing truck
| A．Losing | B．Having lost | C．Lost | D．To lost |
He didn’t make ________ clear when and where the meeting would be held.
| A．this | B．that | C．it | D．these |
The book was written in 1946,the education system has witnessed great changes.
| A． | when | B． | during which | C． | since then | D． | since when |
In this seaside resort, you canall the comfort and convenience of modern tourism.
| A． | enjoy | B． | apply | C． | receive | D． | achieve |
The country has already sent up three unmanned spacecraft, the most recent ____ at the end of last March.
| A．has been launched | B．having been launched |
| C．being launched | D．to be launched |
They ___ two free tickets to Canada, otherwise they’d never have been able to afford to go.
| A．had got | B．got | C．have got | D．get |