It has been predicted that within the next 50 years, scientists ______ a drug to prolong life up to 150 years or more.
His parents ______ married for eight years when he was born.
By April 2010, he ______ for this organization for fifteen years.
She ought to pass her exams so long as she ______.
In the years ahead, it seems likely that people ______ even greater control over nature.
He ______ a cold for the last three days.
Take an umbrella with you in case it ______.
If we compare the mass of hydrogen in a star with the rate at which energy ______, we can estimate its potential life.
We ______ at the Italian restaurant last night, but it was full, so we ate somewhere else.
The day she agreed to marry him was the happiest he ______ ever ______ in his life.
For various reasons, clothing of some type ______ by human beings since the beginning of time.
His hopes of making a fortune ______ when his factory burned down.
Considering the weather is so uncertain, the reception ____ indoors.
Some patients shout in pain while ______ an injection.
We’ll close all the windows in case it ______ while we are out.
rained
rains
will rain
rain
He ______ from the company for several years before they found him out.
The door ______ unless you ______.
Hardly _____ I_____ the phone down when it started ringing again.
In most non-western countries punishment______ as a deterrent.
You ______ pleased to hear that your father______ to the committee.
When eleven o’clock came and he still ______, I began to wonder if he ______ an accident.
The Prime Minister refuses to enter into negotiations with the railway men until they ______ all ______ to work.
