VI. Complete each sentence with a verb in the correct form, -ing or to...
1. We should ... the software before giving it to users.
a) testing b) test
2. I really enjoy ... new skills.
a) to learn b) learning
3. We failed ... the source of the problem, and things kept getting worse.
a) to recognize b) recognizing
4. We suggest ... the manufacturer directly.
a) to contact b) contacting
5. Julia is interested in ... her own business.
a) starting b) to start
6. They must increase the salary ... the right applicants.
a) to attract b) attracting

V. Choose the correct option a-c to complete the sentences.
3. Without any reason the customer returned the goods that we ...
a) delivered b) deliver c) had delivered
4. How long ... in sales?
a) are you working b) have you been working c) were you working

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