It was not ______she took off the glasses ________ I realized she was a famous film star.
The new system has been designed to give students quick and easy ________ to the digital resources of the library.
The teachers hope students can keep a ________ between work and relaxation.
I'll be busy on ________ Sunday morning, and perhaps I'll have ________ late night.
It is high time that we started to consider what ________ we should take to reduce heavy smog caused by traffic fumes and other pollutions.
________ walk is expected to last all day, so bring ________ packed lunch.