-- Shirley, what were you doing at three o’clock yesterday? -- I was sitting by the window, _________

-- Shirley, what were you doing at three o’clock yesterday? -- I was sitting by the window, __________ to the music.

#50092

listen

listening

listened

to listen

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----What do you think of the pop music?------       to the pop music is good way to relax.

#48450

Listen

Listens

Listening

Listened

 My mother has had the clothes _______already．

#49898

was washed

was washing

to wash

washed

Let’s__________ and have a rest.

#49972

stop

to stop

stopping

stopped

I need time_____ my computer.

#49817

to mend

mending

mend

mended

Although we’ve learned English for years, we have trouble _____ the       foreigners.

#50181

understand

to understand

understanding

of understanding

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