In 1720, Bach’s wife suddenly died, him with four children.
| A．leaving | B．to leave |
C．left  |
D．had left |
If by any chance someone comes to see me, ask them to have a __________.
| A．message | B．letter | C．sentence | D．notice |
They were surprised that a child should work out the problem ________ they themselves couldn't.
| A．once | B．then | C．While | D．if |
Mary has _______ a difficult question to me.
| A．put | B．asked | C．made up | D．set |
To the sea captain's surprise, he found that ________ travel could also be quite pleasant.
| A．earth | B．land | C．ground | D．playing |
A piece of ________ music will make you happy.
| A．fond | B．pleased | C．merry | D．glad |