Where is Mr． Green？
He _________the bookshop． You have to wait for him．（ ）
A．was going toB．has gone to
C．has been to
﹣﹣﹣Why does Linda dislike me？
﹣﹣﹣I don't know.You'll have to_______ the reason yourself.（ ）
A．go outB．bring outC．come outD．find out
﹣﹣﹣Would you like something to drink？
﹣﹣﹣No，thanks.I_______ some tea already.（ ）
A．have drunkB．was drinking
C．will drinkD．drink
﹣﹣﹣Lucy，have you changed a mobile phone with 5 G？
﹣﹣﹣Yes，I think the mobile phone with 5 G can send videos much_______ than the one with 4 G.（ ）
A．fastB．fastest
C．the fastestD．faster
﹣﹣﹣Are these books_______？
﹣﹣﹣No，they're his.（ ）
A．yoursB．herC．ourD．their
﹣﹣﹣What did the teacher say just now？
﹣﹣﹣He told us________in the river.（ ）
A．swimB．swimming
C．not to swimD．not swim