You have finished writing an e-mail on computer , but too many mistakes in it . You can click _____ .

We didn’t find the Blacks___________the lecture. —No one had told them about___________a lecture the following day.

How ___________has Yao Ming been playing basketball?[ ]

I found there was only one copy of “Bighead Son and Small-head Father” on the bookshelf, so I decided to buy _______ at once.

Thank you very much your help .[ ]