So far as he could, John had always tried to _____ the example he saw in Lincoln.
Unfortunately, their car _____ in the mud after the heavy rain.
We can’t ____ the punctual arrival of trains in foggy weather.
This test ____ a number of multiple-choice questions.
He soon made _____ clear why he had asked for a conference.
There is no doubt _____ he will finish the task in time.