_______ 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

I ______ him in time, otherwise he would have fallen off the bike.

A．had supported     B．supported         C．have supported     D．support

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

--- 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

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

They suggested that the professor ______ just now ______ chairman of the meeting.

A．referring to; was made                   B．referring to; be made

C．referred to; be made                    D．referred to; was made

The subway was crowded with passengers going home from market, most of ________ carrying heavy bags and baskets full of fruit and vegetables they had bought there.

A．whom            B．them             C．who              D．which

Our society insists on regular habits, timekeeping and punctuality, and whether we like it or not, ______ we mean to make our way in society, we have to comply ( to act in accordance with a demand, rule, etc.) its demands.

A．whether          B．after             C．if                D．until

---Where did you come across our Chinese teacher ?

--- It was in the supermarket ______I purchased mooncakes．

A．that              B．which            C．where            D．when

A series of stimulus policies and supportive measures taken by the government _____ to promote change in the economic environment in this area.

A．are expecting      B．are expected       C．is expecting        D．is expected