When it______ air pollution, Beijing faces the three “C” s-----cars,coal and construction,which lead to Beijing's thick air pollution.
.--- _______? --- He is tall, strong and brave.
. Washington, a state in the US, was named _______ one of the greatest American presidents.
. ---How much do you ________? ---About 60 kg.
You’ll always be _______ whenever you want to visit us.
Can you help me with this math problem? I _______.