Jo has studied abroad since he___from high school.A.graduated B.graduating

Jo has studied abroad since he___from high school.A.graduated B.graduating
School work makes them ___and they don't enjoy learning.A.bored B.boring
That pen is ___.A.her B.yours
My car is red;___is black.A.her B.his
One of the watches is___.A.Jack's B.my
My shoes are white;hers___yellow.A.is B.be
我和朋友们的答案一样，买了本比较权威的语法书，书后练习竟然有真么多错！我无语了！