We should spend as much time as we _______ over our lessons.

Jack is ________ American boy，right–Yes．He’s from ________ USA．

__________, Chinese mobile phones, like Huawei, have improved greatly.— Exactly. That’s why made-in-China products are more and more popular now.

_______ that we can’t get the necessary equipment, we will have to give up theexperiment

Lily’s grandparents live in a town 15 miles _________ Shanghai. It’s very _________ .