_____ when dealing with those chemicals.
A: To be more careful
B: Do be careful
C: Be do careful
D: Do to be careful
A: To be more careful
B: Do be careful
C: Be do careful
D: Do to be careful
举一反三
- _____ when you cross the road. A: Do care B: Care C: Be careful D: To be careful
- According to Mr. Davis, when do we need to be more careful about our table manners?
- ______be careful when crossing the street! A: Must B: Should C: Ought to D: Do
- 当执行这个程序时要小心如果部件坠落，可能造成人员伤害。 A: Be careful when you do this procedure. If the unit falls, it can cause injury to personnel. B: Be careful when you do this procedure. If the unit falls, it can hurt personnel. C: Be careful when you do this procedure. If the unit falls, it can injure personnel.
- It doesn't matter. __________ careful next time. A: Being B: Do be C: Do D: To be