I have worked hard at English, but it seems that I haven’t made any progress.—Keep on _____ at it, and you will be successful.

Will you see to _____ that my apartment is cleaned during my absence? — No, problem. [ ]

The woman ______ a red sweater is his mother.

Nowadays, cycling, along with jogging and swimming, ______ as one of the best all-round forms of exercise.

________ her work has been good, but this essay is dreadful