I wonder how many years ago ___________.
They also agree that it is the burning of more and more fossil fuels that has resulted ____ this increase in carbon dioxide.
____ late in the morning, Bob turned off the alarm.
It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
The warmth of ____sweater will of course be determined by the sort of ____wool used.
— Can you keep an eye on my bag, Tom? I just want to use the bathroom. —____. It will be safe with me.