Everyone should do something to protect the environment________ it is too late.
A.after B.since C.before D.when
All the people in the theatre will keep quiet when the concert________.
A.began B.will begin C.has begun D.begins
I'm very________because I have so many friends to depend on when I am in trouble.
A.nervous B.lucky C.strict D.serious
1 think________is important for us to help our parents do housework during the holiday.
A.this B.that C.it D.what
With the help of Ms.White,I've made great________ in my spoken English.
A.knowledge B.experience C.trouble D.progress
—Have you got________ ready for the get-together. Dad?
—Well,we still have to get another five chairs.
A.everything B.something C.anything D.nothing
