I hear ________ students went to the hall to have the concert.

Scientists also have no idea how long it will be before all wild animals in the cages _____.

do we have a meeting —To choose our monitor.

There’s no light on. —- They ________ be at home.

The experiment has _____ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets. [ ]