Who’s that boy reading in the garden? Is it David?— It ____________ be David. I saw him in the classroom just now．

Wearing red makes _________ easier for you to take action．

I was late for school because my alarm didn’t_________.

It’s said that the famous scientist will give us _________advice on maths study. —__________good news! I’m not good at it.

Millie is a good swimmer and can swim ______ a fish. [ ]