Which sentence is grammatically correct in each of the following pairs of sentences? Choose the sentence with the correct punctuation:

In a gear drive the ratio of the __________ can be used to compute gear ratio.

Which sentence is grammatically correct in each of the following pairs of sentences? Choose the sentence with the correct form of the participle.

Fill in the blanks to complete the adjective clause in the second sentence, using information provided in the first sentence.  (Make sure you write a complete clause for the blank in the second sentence.)(Many companies have your name and address.) Companies ______________________________________________________________________________________________ often send you mail.

Find the mistakes with the underlined words, and correct them in the space provided. Not all of the sentences have mistakes. If there are no mistakes, write “Correct” in the space provided.  Do not make any changes to correct sentences.  (They will be marked wrong.)You’d better don’t ride your bike today. It’s going to rain.

Noun clause: Fill in the blank with an included question.Did she break the glass?I don’t know ____________________________________________________________

Seclect the choice that best fits in the blank according to the rules of formal English.She reads novels ____________ enjoyment.

Seclect the choice that best fits in the blank according to the rules of formal English.We live in an apartment _____ has three bedrooms.

Fill in the blanks with the simple past, the past perfect, or the past perfect continuous of the verb in parentheses.When the train (arrive) [1] at the station, the passengers (get) [2] on.

2. The frequency of operation of a waveguide is determined by the ___ of the pipe.