—How cold here!
—Yes.The weather in Guangyuan is much colder than in your hometown.（ ）
A．thatB．itC．thisD．those
Mr． Wang is very friendly to us． He is of all the persons I know．（ ）
A．patientB．less patient
C．more patientD．the most patient
Before stamps，people didn't______for the letters they sent，but for the letters they received．（ ）
A．payB．costC．spendD．take
______American people and British people speak the same language，their cultures are quite different．（ ）
A．SinceB．IfC．AlthoughD．Because
Students_______enjoy the colorful school life if they study at home instead of going to school．（ ）
A．mustn'tB．can'tC．mustD．can
Now all Chinese couples______to have two children．（ ）
A．allowB．allowed
C．are allowedD．were allowed