Which of the following sentences has an object clause？（ ）
A．His mother called him Robbie when he was a baby．
B．On Mars you might see people who wear special boots．
C．Mr． Green tells us that we'd better use the Internet properly．
D．Our life has improved because the environment is getting better．
Mum， I'd like a cup of coffee．
Dear， why not drink some water？It's ______than coffee．（ ）
A．healthyB．healthier
C．the healthiestD．healthy
Chinese ______by more and more people around the world．（ ）
A．is spokenB．speakC．speaking
Did you see the sign "No Swimming"？You ______swim in this river．（ ）
A．needn'tB．mustn't
C．don't have to
Look! Trees are green and flowers are everywhere．
______beautiful place it is!（ ）
A．How aB．WhatC．What a
I have ______eight﹣month﹣old sister and she is very lovely．（ ）
A．aB．anC．the