课时作业13
Ⅰ.用所给词的适当形式填空
1．Both companies are involved in the ________(join) development of a new medium－sized car.
2．Some students haven't got ________(accustom) to the new school life.
3．It was a really ________(history) moment for mankind when Armstrong first landed on the moon.
4．Almost all Chinese ________(tune) in to watch the Spring Festival Gala.
5．The past thirty years ________(witness) great changes in China's economy.
