My parents have promised to come to see me before I _________ for Africa.

----I have got a headache.
---- No wonder. You ________ in front of that computer too long.

Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.

The stars who advertise some false medicine _____ for the deaths caused by the medicine.

— Are you a member of the club?
—       . It’s years since I       .

— Put these glasses away before they______.
— OK, I’ll put them in the cupboard.

— Is Paul playing both soccer and tennis for the school?
— He ______. But now he has given up playing tennis.

–Were you at school when he came to see you?
–Yes, I ______ a math class.
A. was having               B. had                  C. am having

If there       no buying and selling of animals, there      no killing in nature.  
A. is; will be              B. will be; will be        C. is; is

– Will you please go to see the movie Guanyinshan with me?
– No, I won’t. I           it already.
A. saw                 B. have seen               C. see