Many students are ________ chatting online, which wastes them plenty of time.

for your timely warning, we _____ into greattrouble— Well, you know we’re friends

That must have been a long trip—Yeah, it ________ us a whole week to get there.[ ]

So far the majority of cloned animals have suffered from some different serious disorders, ______ died soon after birth.

.She was, ______ thousands of others, interested in this kind of work