Must I clean the room now，Mom？
No，_________．（ ）
A．you mustn'tB．you needn't
C．you can't
_______ pleasant journey it is!（ ）
A．HowB．WhatC．What a
My best friend helps to ______ the best in me，as the saying goes．（ ）
A．bring outB．bring inC．bring up
Artemisinin _______ by Tu Youyou，a great Chinese scientist．（ ）
A．was inventedB．invented
C．has invented
As our children get bigger，our house seems to get ________．（ ）
A．the smallerB．smaller
C．smallest
The watch _______ you gave me keeps perfect time．（ ）
A．whoB．whatC．that