1.He asked me a second question _________ I could answer the first one.( )
A. | before | B. | while | C. | until | D. | for |
20.When you arrive at your job in the morning,let the first thing you say_____ everyone's day( )
A. | to brighten | B. | brightening | C. | brightened | D. | brighten |
19.Our class will go to the National Park next Sunday--________ it rains,of course.( )
A. | when | B. | unless | C. | for | D. | whether |
18.I always take something to read when I go to the doctor's _______ I have to wait.( )
A. | in case | B. | so that | C. | in order | D. | as if |
17._______ he referred to in his article was unknown to the general reader.( )
A. | What | B. | That | C. | Whether | D. | Where |
16.-When do we need to pay the balance?
-______________ September30.
-______________ September30.
A. | In | B. | By | C. | During | D. | Within |
15.They were walking on the street __________ they noticed an injured dog lying on the pavement.( )
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A. | while | B. | since | C. | when | D. | until |