No one really knows exactly dfwhen the first people arrived in we now know as California
John is no less hardworking than his sister, _______ he failed in the exam.
---People should use public transport instead of their own private cars. --- _______.The roads are too crowd as it is.
--- I saw Mr Li at the meeting yesterday.--- Did you? He ______ have attended, for he had asked for sick leave.
Elizabeth believed the dog would die if ________ to her cruel owners so she kept it.
Chatting online can be _____fun, but kids must be sure they stay safe on _____web.