—Isn’t that Ann’s husband over there?—No, it ______ be him-I’m sure he doesn’t wear glasses.
Many people believe that _______ will takes years to develop a car that does not pollute the air.
They have been woking on this project for one month. It seems they need ________ month to finish it.
________your generous help, we could not be living a happy life today.
.After they were given several terrible blows, the enemy did not _____ out after dark.
I thought it a pity __________ him to the tea party.