Sitting under the willow trees ____ an old man.
A. is B. are C. is there D. are there
It was with the selfless help of our teacher ______ we realized our dream.
A. that B. who C. when D. how
To build a harmonious society, we all have a part to play in the fight ____ injustice, unemployment and crime.
A. over B. by C. for D. against
This chemical material is very toxic. So put it ______ the children’s reach.
A. by B. beyond C. within D. from
The central heating system of this office building is down and several workers ______ it right now.
A. had repaired B. have repaired C. repaired D. are repairing
China's present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it.
A. hadn’t acted B. haven’t acted C. don’t act D. won’t act
