This class ________ now. Miss Gao teaches them.
| A．are studying | B．is studying |
| C．be studying | D．studying |
Our Earth will be ________ if we go on cutting down millions of trees every year.
| A．in great danger | B．danger | C．dangerously | D．out of danger |
Trees provide food and shelter and make us ______ comfortable.
| A．feeling | B．feel | C．feels | D．felt |
Trees make our city more beautiful and ________ noisy, do you think so?
| A．much | B．little | C．less | D．fewer |
Three trees can do the job of 15air-conditioners _________ almost all day.
| A．run | B．are running | C．ran | D．running |
He gave me clothes _____ food.
| A．as nice as | B．as long as | C．as well as | D．as soon as |