Leonardo da Vinci (1452-1519) ____ birds kept in cages in order to have the pleasure of setting them free.

—English has a large vocabulary, hasn’t it?—Yes. _____ more words and expressions and you will find it easier to read and communicate. 

Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months. 

Attractive ________ the device might seem, “my wife has already done that by herself” was a common response after people seeing it when it was introduced on show this week. 

Although she is only 17 years old, she _________ drugs for two years.