—      does Grace do her English exercises every day?—About thirty minutes.

— ______ will you stay in America?— About two months. 

 ---______ your school ______ a School Day ? ---Yes , it is in May . 

Mrs Black doesn’t believe her son is able to design a digital camera, ______  ?

—I don't imagine Russ and his poor dog had a good time on 　the deserted island，________？—I have no idea.