—Where is Mother?
—She is in the kitchen. She ________(do) the housework all morning.
The headmaster hurried to the concert hall only ________ (find) the speaker ________(go)．
After many years' hard work, she now is pleased ________ playing almost all kinds of music.
Every day a number of tourists take pictures in front of the tower, which dates ________ as early as 800 years ago.
________ (assume) that we can't get the necessary equipment, we will have to give up the experiment.
—Was the driving pleasant when you went to Mexico last summer?
—No, it ________ (rain) for four days when we arrived, so the roads were very muddy.
