Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
| A．sense | B．view | C．means | D．idea |
Only when he returned _________ that the war had ended and the army had come back.
| A．we tell | B．we told | C．did we tell | D．were we told |
--- Can you introduce me a high quality machine?
--- My pleasure. _______ well even on wet roads, this kind of car is very popular.
| A．Handled | B．To handle | C．Handling | D．Being handled |
September 8th，1931 is a special day，________, I think，that will be remembered by the Chinese forever.
| A．one | B．it | C．which | D．that |
I ______ him in time, otherwise he would have fallen off the bike.
| A．had supported | B．supported | C．have supported | D．support |
_______ 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 |