A number of boys（)absent some time during the ter

The trouble－free life of an engine indicates _____.A.the period of time during which no tr

What is the approximate range of MF radio waves during the day time？A.30 nautical milesB.6

What made the boy have some understanding of the horrible ants？ ______.A．The uncomfortable

Frequently single－parent children take on some of the functions that the absent adult in t

When the bell sounded, the boys rushed out of the classroom, each______ a number of new bo

A number of books______ missing from the library during the Second World War.A．beB．beingC．