The police must be careful and calm when conducting security checks.
举一反三
- 4. All passengers and those who come to pick up or see people off must undergo security checks.
- An person must do important checks. A: An approved<br/>person must do the important checks. B: A qualified<br/>person must do the important checks. C: A trained<br/>person must do the important checks.
- 关键的检查必须由授权的人来进行。 A: An approved<br/>person must do the important checks. B: An allowable<br/>person must do the important checks. C: An authorized<br/>person must do the important checks. D: An capable<br/>person must do the important checks.
- ______be careful when crossing the street! A: Must B: Should C: Ought to D: Do
- You ______ be too careful when you are driving. A: should B: needn't C: cannot D: must