John opened the door . There _____ he had never seen before.

It is hard for me to imagine what I would be doing today if I _____ in love, at the age of seven, with the Melinda Cox Library in my hometown. [ ]

The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck

The number of the workers in this factory ________1,500. A number of them ______ from the countryside.

The Chinese students have_____weeks _____in the summer than American students.