Parallaxes of stars were not observed by ancient astronomers, which is one of the reasons they rejected the idea of a heliocentric model of the universe (everything orbits the Sun) in favor of the geocentric model (everything orbits the Earth). Why were they unable to observe stellar parallaxes? 

Liz (used to, ride) ____ a motorbike, but last year she (sell) ____ it and (buy) ____ a car.

(Used to, eat) ____ a lot of sweets when you (be) ____ a child?

I (see) ____ you in the park yesterday. You (sit) ____ on the grass and (read) ____ a book.

Tom (burn) ____ his hand when he (cook) ____ the dinner.

Dennis (give up) ____ smoking two years ago. He (used to, smoke) ____ 40 cigarettes a day.

This time last year I (live) ____ in Brazil.

Which of the following companies has the largest market share in the enterprise resource planning industry?

How can the problem of information silos be solved?

What are the individual-related issues faced by enterprise resource planning (ERP) implementation teams?