We still know little about the Moon_________men have landed on it．（　　）

A．ifB．sinceC．althoughD．because

China's efforts to stop the spread of COVID﹣19 will the world's ability to limit the harm in the near future．（　　）

A．imagineB．inventC．insistD．improve

Sorry， you can't take the dictionary away，Vicky．I it．（　　）

A．usedB．am usingC．have usedD．was using

Jenny just wondered Angela already knew about the event．（　　）

A．how soonB．how manyC．how oftenD．how much

By the time she was eight， Linda read English and French．（　　）

A．couldB．mustC．needD．may