David's responses were ______ than anyone else's and he won the competition．（ ）
| A． |
quick |
B． |
quicker |
| C． |
quickest |
D． |
the quickest |
_______ 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