________ is known to everyone, the moon travels around the earth once every month.
| A．It | B．As | C．That | D．What |
Tom was thinking about how to explain to the teacher why he was late for class, when a good idea _______him.
| A．happened | B．brought | C．occurred | D．struck |
A recent study shows that health problems are closely_______bad eating habits and a lack of physical exercise.
| A．connected with | B．related with | C．connected to | D．joined to |
The couple decided to adopt the child whose parents ________in an accident.
| A．had been killed | B．are killed | C．had killed | D．killed |
John is very _____---if he promises to do something he’ll do it.
| A．incredible | B．confidential | C．reliable | D．flexible |
The performance______ nearly three hours, but few people left the theatre early.
| A．covered | B．reached | C．played | D．lasted |