（ ）1．—You’ve dropped _____ “s’’ in the word “gras’’．
—Oh，____ letter “s’’ should be doubled like this “grass’’．
A．a，a B．an，a C．an，the D．the，the
（ ）2．—Who will teach ______ to make a cake tomorrow？
—_______．You can learn it by yourselves．
A．we；Somebody B．us；Nobody
C．our；Nobody D．us；Somebody
