8, three American scientists invented ____transistor, which is ____ small electronic device to control an electriccurrent.

The US President Obama told the students that he ______ by a single mother who were strict with him and wished him great success in his studies

d say sorry to your Mom, Dave.—I’d like to, but I’m afraid she won’t be happy with my ______ .

Pandas are very _____ and ______. So we all like them.

What’s wrong with Mary- She’s_______ at her sister’s bad behavior.