单选题 Some creams we tested failed to give __________ protection against… UV light.

单选题 The twins were so much alike that it was impossible to __________ one from the other.

单选题 The robber reached out() and __________ the back pocket of my trousers for anything valuable.

单选题 I __________ an old friend yesterday. It brought back memories.
。

单选题 The newspaper article caused the actor considerable __________.

单选题 As evidence began to accumulate, experts __________ investigate.

单选题 She saw that there was indeed a man immediately behind her.。 __________, he was observing her strangely.

单选题 Unfortunately, also like her mother, she developed()blood cancer because of __________ to radiation.