---Mr. White didn’t come last night, did he? ---No. We for him. A whole night was wasted. A. had waited B. have been waiting C. were waiting D, had been waiting
. ---- It’s a secret _____ you and me.
I think going swimming in my spare time, _____ I think is great fun and good exercise as well as a useful skill.
Thanks to the Internet, large quantities of information are now _____ to us in our home.
. Man must produce more grain to support the _____ growing population on earth.
The theory wasn’t accepted by many people when it was first ____, but it proved to be true as time went by.