He _______ in a university for five years, but now he runs a company of his own.
| A．has taught | B．had taught | C．taught | D．has been teaching |
_______it comes to traffic rules, I often come across such cases ________the local drivers obviously know them but won’t follow them.
| A．If; why | B．As; which | C．Once; as | D．When; where |
Everything was perfect for the picnic _____ the weather.
| A．in place of | B．as well as | C．except for | D．in case of |
The course normally attracts 20 students per year, ________up to half will be from overseas.
| A．in which | B．for whom | C．with which | D．of whom |
____ red is a symbol of warmth, it can sometimes make people feel uneasy or even frightened.
| A．As | B．Since | C．If | D．While |
This is the second time that the top 10 list of popular novels _____ published by this magazine.
| A．has been | B．are | C．is | D．have been |