In Text 1, the words in bold type function (1) as a noun; (2) as a verb in the past participle; (3) as a verb in the gerund form; (4) as a verb in the imperative form.
Choose the alternative in which the underlined words fulfil the same function as in the sentences below respectively:
1. “Memory Loss on Your Mind?” (line 1)
2. “You've lost your keys (again!)” (line 3)
3. “I'm losing my memory!” (line 5)
4. “Use it or lose it!” (line 39)
