Could she copy her friend’s answers—No, she ______.

Nowadays people sometimes separate their waste to make it easier for it ________.[ ]

No one but the experts in this field can _____ the difference between them.

We arrived at the station too early and had togo, so we sat there and chatted with each other.

The plane is due to take off at 7∶50 from the airport–________ we fail to arrive there in time?