The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
| A．to be invented | B．having been invented |
| C．invented | D．to have been invented |
Only when in the afternoon able to leave.
| A．the match was over; they were | B．was the match over; were they |
| C．was the match over; they were | D．the match was over; were they |
There are 51 students in Class Three, _____ failed in the test.
| A．all of which | B．all of them | C．none of whom | D．none of them |
______ happened to be no one in that house when the typhoon hit the area.
| A．It | B．There | C．This | D．That |
. ________, as long as I’m with nature, I don’t care.
| A．However tough the voyage is | B．Whatever tough the journey is |
| C．However the voyage is tough | D．Whatever the journey is tough |
I would rather buy a house in the countryside than in the city.
| A．it | B．one | C．this | D．that |