Many people expect that credit cards will eventually______ paper money for almost every purchase.
A. trade B. replace 
exchange D. reduce
As your teacher,I could not have you______away with cheating in the exam．
| A．get | B．getting | C．breaking | D．break |
Going abroad to study requires a big adjustment and it usually takes a while to ______．
| A．calm down | B．fit iri | C．keep up | D．cheer up |
Failure can make a positive contribution to your life______you leam to use it．
| A．since | B．unless | C．until | D．once |
The police have issued a detailed______of the missing boy．
| A．direction | B．expression | C．description | D．instruction |
－Did you receive my letter?
－I received one just as I______
| A．set out | B．had set out |
| C．was setting out | D．would set out |