________ they are observing can be tested in a practical way, scientists will use exp

Sara：Can I help you with the luggage？It looks a bit heavy． Henry：__________．A.Yes，they are

Lions can be photographed easily when ______.A．they are following a trail of something tha

Because slogans are "social symbols" they ______.A．can have different meanings in differen

These creatures are so tiny that they can not always be seen with the ______ eye.A．bareB．n

When people are surrounded by ______ communication and encouragement, they can find th

It can be inferred that ______.A．people are not allowed to drive after they drink one quar