I'm feeling much better now so you ________ call the doctor.
As you study a globe,you may notice that ______ of the large land and areas are connected,or ______so.
The houses in this village are______built of bricks.
The poisonous atmosphere will surely ______a lot of people.
Before the first nonstop flight made in 1949,it______necessary for all planes to land for refueling.
—Have you found anything wrong with your computer? —Yes,and I was about to give it up when an idea ______to me that it may be struck by some kind of virus.