【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[integrity; conscience; yield; appoint; assure; ensure; demonstrate; clarify; preserve; scarce]3. After[填空1]how to do it, the chemical experts told the graduates to begin the experiment.
【简答题】
Directions: Fill in the blanks with the words given below. Change the form if necessary.[fee; react; expand; besides; quantity; stay; highly; device; customer; commercial]5. Popular television plays are often interrupted by[填空1].
【简答题】
Direction: Fill in the blank with the correct form of the word given.5. The new ambassador presented his[填空1](credential)to the President yesterday.