Could I do some explanations? Ito call on you yesterday, but someone came to see me justwhen I was about to leave.
We were told that we should follow the main road ___ we reached the central railway station.
Scientists say it may be five or six years ___ it is possible to test this medicine on human patients.
Tom’s and Joan’s ____ came to London last week.
You can hardly imagine the difficulty the woman had _____ her children.
No one ____ this building without the permission of the police.