This button .... in any circumstances.
If the guard ....., the museum ....
He said strange things! He must .....
The reactions of the rats ...... by scientists.
The decorator .......... the payment for refurbishing the house.
The new ring road .... long ago.
My friens's new car ....
Heavy smoking is likely ......... her cancer.
I'm not used to ........ like that.
Where's Tom? I'm getting worried about him.