By working slowly but surely towards your goal, you’ll _____ succeed.

——It will be terrible to see the nuclear war happen. ——That’s right. Nuclear science should be developed to benefit the people   _____   harm them.

 ----What do you think of the film we saw last night? ----I feel ______ that the film is well worth seeing once more.

John is very lazy. He falls ______ behind among the students.

I came here       to see you.