Frank put the mediocre in the top drawer to make sure it would not be_______ to the kids. 
| A．accessible | B．relative | C．acceptable | D．sensitive |
The price system is a complex network composed of the prices of all the products bought and sold in the economy as well as of a great number of services.
| A．the one | B．that | C．ones | D．those |
I ______ tell you with certainty that he won’t be able to finish it before the deadline.
| A．will | B．must | C．can | D．may |
His humorous closing speech was a welcome addition to the ______dull meeting．
| A．therefore | B．meanwhile | C．otherwise | D．nevertheless |
Someone _______ his car in front of my house and it is blocking my driveway.
| A．had parked | B．was parking | C．parked | D．has parked |
Many people can’t learn any lessons from the mistakes they’ve made_____they get hurt somehow.
| A．whether | B．unless | C．if | D．as |