_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as | C．If only | D．So long as |
But for the fact that Ian unexpected visitor, I _____to the lecture.
| A．had had/would go |
| B．had/must go |
| C．had/would have gone |
| D．had had/must have gone |
The old man, forlife had been very hard, donated his possessions to poor villages in Anhui.
| A．whose | B．whom |
| C．which | D．that |
--Why do you look so upset, Linda?
--There are so many troublesome problems____.
| A．remaining settled | B．remaining to be settled |
| C．remained to settle | D．remained to be settled |
I lost the key to my dormitory. Could you ____ for the night?
| A．put me up | B．take me up |
| C．set me up | D．bring me up |
--Silly me! I forgot the color of my luggage.
--What aboutover there?
| A．the one | B．one |
| C．that | D．those |