The professor can hardly find sufficient grounds his argument in favor of the theory.
| A．which to base on |
| B．on which he bases |
| C．to base on which |
| D．which to be based |
Large quantities of water , as well as some other timely help including a medical team, _____ since the serious drought hit Yunnan Province.
| A．has offered | B．had been offered | C．have been offered | D．is offered |
—How did it _____ that you made such a silly mistake?
—I myself haven’t figured it out yet.
| A．bring about | B．come about | C．come across | D．come on |
The company has launched several types of cars this year, and one_______ appeals to the young.
| A．in return | B．in particular | C．in addition | D．in turn |
It is _______ of the students to stay up reading till late night before the final exam.
| A．common | B．typical | C．normal | D．regular |
Considering the advantages of the method, they decided to it.
| A．arrange | B．possess |
| C．adopt | D．attach |