You should be ____________．As everyone knows，study takes time．（ ）
A．strictB．worriedC．freeD．patient
His mother won't be there，________ his father might．（ ）
A．andB．butC．or
_______ 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