Bob would have helped us yesterday, but he ____________.
| A．is busy | B．had been busy | C．has been busy | D．was busy |
How long do you think it will be ________ the computer company puts forward a new product?
| A．before | B．since | C．until | D．that |
Several of the passengers were hurt and one was taken to hospital. Luckily ____ was killed.
| A．no one | B．not all | C．none | D．no other |
I can’t say which type of tea tastes better. It’s just a（an） ______ of personal preference.
| A．affair | B．problem | C．variety | D．matter |
______ that he has no qualifications in business management, Ken plans to gain the necessary skills by taking a part-time course.
| A．Concerning | B．Concerned | C．Being concerned | D．To concern |
His health failing, ______ last year.
| A．so the school gave Mr. Smith leave | B．the school had given Mr. Smith leave |
| C．so Mr. Smith went on leave from work | D．Mr. Smith went on leave from work |