John didn’t feel well yesterday; otherwise he ______ to see his friend off at the airport.
A．came B．would come C．would have come D．should be coming
_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
A．Now that B．Ever since C．So that D．As long as
Before the first nonstop flight made in 1949, it_____ necessary for all planes to land for refueling.
A．would be B．has been C．had been D．would have been
Students who pass the test will be ______ to the next grade, as has been announced.
A．possessed B．promoted C．proposed D．appealed
When choosing a product, I sometimes try to figure out the meaning___ to its brand name.
A．attaching B．having attached C．to attach D．attached
There is hardly an environment on earth ______ some species of animal or other have not adapted successfully.
A．to which B．in which C．for which D．on which
