______ was not until the early 20th century _____ the importance of his ideas was realized.
| A．What; that | B．It; that | C．That; so | D．It ;when |
—Mom，Dad is smoking again!
—Well，let him cut it ________ gradually since old habits die hard.
| A．off | B．down | C．up | D．out |
As we have known from the map of the world，this is ________.
| A．twice as large an island as that | B．twice as larger as that island |
| C．as twice large as that one | D．twice as a large island as that |
Ｉstill remember the day when I said goodbye to my family, ________on the plane and started my journey to London.
| A．to step | B．stepping | C．stepped | D．having stepped |
There is no doubt，in my opinion， ________matters is not the speed，but the quality of the product.
| A．that | B．which | C．what that | D．that what |
Maybe all Americans realize that______ they expect to be next president will face lots of problems.
| A．no matter who | B．whoever |
| C．whomever | D．no matter whom |