_________ is known to all，good friends _________ happiness and value to life.
| A．It； add | B．As； add | C．It； add up | D．As； add to |
The workers wouldn’t run the _______ in letting an unreliable person take charge of the factory.
| A．risk | B．danger | C．chance | D．trouble |
You will find the map of great ____ especially when you get lost in a strange place.
| A．price | B．cost | C．value | D．count |
Your smile is one of the strongest tools that make ______ possible for you to meet new people.
| A．it | B．them | C．this | D．/ |
He suggested that we ____ the plan later, which suggested that he ____ against it.
| A．discussed; was | B．would discuss; should |
| C．discuss; was | D．should discuss; should be |
___ for the fact that you were lazy, you could have finished the assignment by now.
| A．It were not | B．Weren’t it | C．Had it not been | D．Had not been |