She is willing to help you, ________ busy she is.
A. what        B. how        C. however        D. whatever

 ________ comes to the party will receive a gift.
A. No matter who        B. Who        C. Which one        D. Whoever

 We should finish the important job，________.
A. long it takes however        B. it takes however long
C. long however it takes        D. however long it takes

 Although he is considered a great writer，________.
A. however his works are not widely read        B. but his works are not widely read
C. his works are not widely read        D. still his works are not widely read

 ________ you talk to someone or write a message，you show your skills to others.
A. At times         B. Some time        C. By the time         D. Every time

 I hurried ________ I wouldn’t be late for class.
A. since         B. so that        C. as if         D. unless

 They went on working ________ it was late at night.
A. even if         B. as if        C. however         D. as though

 If you ________ this experiment，you will understand the theory better.
A. will be doing        B. have done        C. will have done         D. would do

 The problem won’t be settled until we ________ a chance to discuss it thoroughly.
A. have had         B. will have        C. will have had         D. would have

 I’ll be back before you ________.
A. will leave         B. will have left        C. leave         D. would leave