The defense computers calculate way to （ ） the enemy missiles.

Scientists say it may be five or six years （ ） this medicine is tested on human beings.

She didn’t want to go to Africa: probably （ ） the weather is too hot.

They didn’t come to the party， though they （ ） that they would.

In the experiment we kept a watchful eye （ ） the developments and recorded every detail.

The sales manager had his secretary _____ a press conference for their new products.

We arranged to meet at the station but she did not （ ）.

It’s high time we _____ strict measures to stop pollution.

—Shall we invite Tim? —No， it’s too late to invite any more people. _____， he hates parties， you know.

We’re talking about the piano and the pianist （ ） were in the concert we attended last night.

The first question we will discuss is _____ we should go there so early tomorrow.

All the traveling _____ are to be paid by the company if you travel on business.