Jane _____ these families of chimps for many years and helped people understand how much they behave like humans

mainly on natural resources , the prosperity of the city was _______ and its economy almost collapsed when coal prices began to fall in 2012.

What do you want to be in the future,Linda ——I want to be ______ pilot like Wang Yaping. Working and giving lessons are so interesting and exciting.

On the other hand, the influence______ eating habitson people’s emotions was also neglected most of the time.

There is a clock _______ the wall andwindows are _____ the wall.