The beautiful mountain village ___we spent our holiday last year is located in _ _ isnow part of Guangxi

Many gases inthe atmosphere actually heatenergy that escapes from the Earth’s surface back to the earth.

Sally asked________________________.

The astronauts have to lie ________ the floor of thespaceship to fight against the great pressure during the flight

Mountain climbing must be very tiring, ________,you might feel sick with the air getting thinner