_____ inviting guests and not treating them properly!
The scientist________ the behavior of the mice after they were given the drug.
It may rain,but I shall go out ________.
Though plastic bags really bring convenience to us,they also ________ many problems for the environment.
He was observed ________ into the house before the owner came back.
—The strong wind has a bad ________ our newly planted young trees.—What’s more,it ________ many people riding bikes on the road.