–When has the country been united as one?
--______1998, I suppose.
| A．In | B．From | C．After | D．Since |
My friend, Tom, may have missed taking the flight to Africa, ______ he can’t arrive for another hour.
| A．in which case | B．in that case | C．in case | D．in any case |
The sports meeting, due to ______ this weekend, has been put off due to the rain these days.
| A．being held | B．holding | C．hold | D．be held |
Researches are convinced ______ the positive effect of laughter ______ physical and mental health.
| A．of; at | B．by; in | C．of; on | D．at; on |
The ______ scene where the accident happened made him ______ to death.
| A．scary; scared | B．scared; to scare |
| C．scared; scary | D．scary; scary |
It suddenly ______ to the detective that the professor was probably murdered by his own wife .
| A．came about | B．took place | C．happened | D．occurred |