Nothing is ever accomplished by a committee, ________(除非它包括三个成员),one of whom happens to be sick and another absent.
If you are very busy, how could you get the major information from the newspaper?
You could read the __ and the
______first made Mark Twain known all over the country.
Psychemedics Corp is a company that______drug test kits.
Please remember (lock) __ the door when you leave.
When must the sonar devices be placed?
Before the ______.