It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.
| A．produced | B．producing |
| C．to produce | D．having produced |
.
______ online shopping has accounted for a large part of the total purchase volume, many people think the traditional shopping style is irreplaceable.
| A．Because | B．Once | C．Unless | D．Although |
.
Many companies give away small quantities of their produce as samples ____ people can try them before buying them.
| A．if | B．because | C．so that | D．since |
.
— Is there any possibility ____ you could pick me up at my office at 7：00 tomorrow evening?
— No problem.
| A．when | B．which | C．if | D．that |
.
Many scientists believe that now we can study the behavior of a three-year-old child to see ____ they
will grow up to be criminals.
| A．that | B．how | C．why | D．whether |
.
One advantage of eating a balanced breakfast is _____ it can keep you energetic throughout the day.
| A．that | B．how | C．when | D．whether |