The argument remains extremely heatedit is necessary to frequently update teaching material.

The little baby, if _________ by other people, will wake up and cry.

Tom __________ fishing, but he doesn’t like eating fish.

It is known to us all E-mail is ______ efficient than sending a fax [ ]

Is this _______ useful book about health.—Yes, many famous doctors in it encourage us to take active part in sports.