Not until he left his home __________ to know how important the family was for him．
| A．did he begin | B．had he begun | C．he began | D．he had begun |
Always read the _____on the bottle carefully and take the right amount of medicine.
| A．explanations | B．instructions | C．descriptions | D．introductions |
—If you like I can do some shopping for you.
— That’ s a very kind _______.
| A．offer | B．service | C．point | D．suggestion |
School children must be taught how to deal with dangerous ________.
| A．states | B．conditions | C．situations | D．positions |
When Jane began to take swimming lessons, her main _____ was the fear of water.
| A．evidence | B．crisis | C．obstacle | D．danger |
Finding information in today’s world is easy. The ______ is how you can tell if the information you get is useful or not.
| A．ability | B．competition | C．challenge | D．knowledge |