Sentence Completion

A pinnacle (n.) is the highest level or degree available.

Toilsome (adj.) means laborious or hard work.

Tantamount (adj.) means equal to; having equal or equivalent value in terms of seriousness.

A sleight (n.) means a trick or feat so deftly done that the manner of performance escapes observation.

Obscure (adj.) means not clearly expressed or easily understood; not easily seen or distinguished.

To prosper (v.) means to be successful.

To vitiate (v.) means to spoil; to make faulty or impure; to corrupt morally.

To procrastinate (v.) is to put off from day to day. 501 Sentence Completion Questions

To list (v.) (related to a vessel) is to incline or to cause to lean to one side.