I was doing my homework while my parents__________ TV last night.

She was walking down the road _______ sheheard someone shouting for help

The president has decided to put _____ he thinks is energetic, experienced and has good qualities in the position of the leadership of the firm.

Persons under 16 ______ not be employed in our country．

________ she couldn’t understand was ________ fewer and fewer students showed interest in her lessons