It is well known that knowledge is________treasure house，but practice is________key to it.
| A．a；the | B．the；the |
| C．a；/ | D．/；the |
____ the weather, the athletic meetings will be held on time.
| A．Instead of | B．In relation to | C．On behalf of | D．Regardless of |
The ground is slippery. Hold onto the rope and don’t ____.
| A．put off | B．turn up | C．let go | D．take apart |
The week-long rainfall has ___ landslides and flooding in the mountain areas.
| A．set about | B．brought about | C．come about | D．put about |
Many scholars and experts from all over the world will be invited to attend this yearly ___ on drug control.
| A．reference | B．intention | C．conference | D．interaction |
. My grandmother likes to surprise people. She never calls ___ to inform us of her visits.
| A．beforehand | B．anyhow | C．originally | D．consequently |