--What is that on the table?  --Oh, a set of ___________ on the table.

What the science teacher does and says ____ of great importance to college students. 

Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.

There ______ lots of sheep and pigs on my uncle’s farm now.

— Mike, what did our monitor say just now?—Every student as well as teachers who are to visit the museum _____ asked to be  at the school gate before 6:30 in the morning.