Has Jack solved the difficult math problem？
Not yet． But I believe he_____in a few minutes．（ ）
A．has worked it outB．will work it out
C．was working it outD．works it out
______ to smile at your life when you are in trouble，and you will soon be happy again．（ ）
A．TryB．To tryC．TryingD．Tried
Hey，Jane．______ are you feeling now？
Much better．Thanks．（ ）
A．WhatB．WhereC．HowD．When
This museum ______ here for over 80years．It ______ one of the oldest buildings in this city．（ ）
A．is； wasB．had been； is
C．was； has beenD．has been； is
Xiandao Lake in Yangxin is the famous place ______ we'll visit next week．（ ）
A．thatB．whoC．whereD．whom
Sorry，Miss Liu．I left my workbook at home．Must I hand it in today？
No，you ______．You ______ bring it here tomorrow．（ ）
A．mustn't； shouldB．can't；must
C．mustn't；mayD．needn't；can