106. It takes a whole year for the earth ______ round the sun once.
a. traveling b. to travel c. traveled d. travels
107. The factory ______ next year will be one of the largest in this city.
a. to build b. to be built c. being built d. having been built
108. With the guide ______ the way, we set off on foot into the dark night.
a. leading b. led c. leads d. to lead
109. They got the work ______ before the rainy season set in.
a. to do b. done c. doing d. did
110. Things are known ______ when they unite with the oxygen of the air.
a. burningb. to burn c. burn d. being burning
|
|
