When Bill fell down on his way home, Mark ______.

(单选题)I’m sure that your letter will get ______ attention. They kn (单选题)Young people nowadays could not imagine what difficulty thei (单选题)The dog seems very quiet now, but he still ______ go by. (单选题)Take a taxi, ______ you’ll miss your train. (单选题)______ it or not, his first attempt was a great success. (单选题)—May I know how old you are?—Well, if you ______ know, I’m 3 (单选题)28.（） (单选题)If you suspect that the illness might be serious, you should (单选题)______ surprised me most was ______ the girl passed the driv (单选题)We ______ on the project for two hours. Let’s have a rest.