how many students are there in the classroom —_____Idon’t know where they have gone.

14. Over the long process of evolution, animals have developed their ______ senses, which makes it possible for them to _____ their environments.

When a friend of mine comes _____ difficulties, I will give him or her my hand the first time

Simon, what do I need to take for the trip— You’d better ______ more water. It’s hot today.

Copy the expression ___________, please, without any changes