Rick，could you help me cook dinner？
Sure，_____．（ ）
A．no problemB．never mind
C．here you areD．you're welcome
Dr Li's wife about him very much when he worked in Wuhan in February， 2020． （ ）
A．worryB．worriesC．worried
smart! This new kind of taxi can go without a driver．
Amazing! Let's have a try． （ ）
A．WhatB．HowC．What a
is necessary for us to wash hands when we are back home．（ ）
A．ItB．ThatC．This
China is famous its long history．（ ）
A．atB．inC．for
Nowadays， Xiangtan is nice city to live in． （ ）
A．aB．anC．/