B．efore you mail this letter， you should check again whether you have _______ it or not.

    A.sunk B.sighed C.sought D.sealed

 

[问答题]You should look around before you cross the street.

[单选题]If you like I can mail this letter for you? _______.A.That's very kind of y

[单选题]Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.A . deflectionB . discrepancyC . errorD . tolerance

[单选题]You should [convert]RMB into foreign currency before you go abroad.A.alterB

[单选题]You should have [blended]the butter with the sugar thoroughly before you he

[单选题]You should have [blended]the butter with the sugar thoroughly before you he

[单选题]You should work for __________ if you become an editor of the magazine.A． just nine hours a dayB. no less than nine hours a day C. about ten hours a dayD. less than 25 hours a week

[单选题]_____you may have, you should gather your courage to face the challenge.A． However a serious problemB． What a serious problemC． However serious a problemD． What serious a problem

[单选题]I should have told you! You ______ the entire house. Our cleaning lady phoned she's coming tomorrow.A． didn't need to cleanB． needn't have cleanedC． don't need to cleanD． mustn't have cleaned

[单选题]If you make apromise,you should [fulfill] it.A.keepB.takeC.tryD.win