30. —This wall of air is an effective answer to the problem and it ______ work. —But it is a question to put such a wall of air around the statue.
It's ten years since the scientist _______to discover the valuable chemical.
I called Bruce many times yesterday, but I couldn’t get through. His brother ____ on the phone all the time.
Although Fleming discovered Penicillin, it was over a decade ______ someone else turned it into the great drug of the 20th century.
—Look! Here is a message on my mobile phone, asking me to send money to....—Don’t believe it! It’s a trick. More than one person _____ by such tricks so far.
_____ what could happen, he did whatever he liked to and nobody could stop him.