Can you tell me how many English words ____ since 1996?

• A. have you learned
• B. did you learn
• C. you have learned
• D. you learned

I don’t know _____ he will come tomorrow. _____ he comes, I’ll tell you.

• A. if; Whether
• B. whether; Whether
• C. if; That
• D. if; If

—I hear Sam has gone to Qingdao for his holiday.
--Oh, how nice! Do you know when he_______?

• A. left
• B. was leaving
• C. has left
• D. had left

—I hear Sam has gone to Qingdao for his holiday.
 --Oh, how nice! Do you know when he_______?

• A. left
• B. was leaving
• C. has left
• D. had left