In doing scientific experiments one must be _______ careful with the instruments.
| A．other than | B．rather than | C．less than | D．more than |
John thought it wouldn’t be long _____ he was ready for his new job.
| A．since | B．when | C．before | D．after |
The general demanded that the soldiers _____ at the village before 5p.m. to rescue the victims of the earthquake.
| A．will arrive | B．arrive | C．would arrive | D．arrived |
Jack doesn’t smoke now, but he _______ for almost twenty years.
| A．was smoking | B．had smoked | C．has smoked | D．smoked |
The manager says he really can’t ______to wait another day, because he is so busy.
| A．afford | B．waste | C．spend | D．cost |
______ of danger in the street at night, she had to go home, with a friend _____ her.
| A．Warned ; accompanied | B．Warning; accompanying |
| C．Having warned; accompanied | D．Having been warned; accompanying |