1 It's no doubt that () are useful.
2 He made great progress in learning English.
3 We must keep our classroom clean every day.
4 We have to play on our own because it is raining.
5 My father is reading a newspaper on the sofa while my mother is doing housework.
1 though
2 taught
3 pleased
4 autumn
5 suddenly
6 through
7 seen
8 something
9 usual
10 covered
1.though 2. taught 3.pleased 4.Autumn 5.suddenly 6.out of
7.seen 8.something
.9.usual 10.covered
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