Complete each sentence by writing the correct present-tense form of the verb indicated. Both pork and beef _____ high levels of fat. (have)

A meat market combines ground beef and ground pork in a single package for meat loaf. The ground beef is 75% lean (75% beef, 25% fat) and costs the market $0.75 per pound (lb). The ground pork is 60% lean and costs the market$0.45/lb. The meat loaf must be at least 70% lean. If the market wants to use at least 50 lb of its available pork, but no more than 200 lb of its available ground beef, how much ground beef should be mixed with ground pork so that the cost is minimized?

Underline the verb in parentheses that best completes each sentence. Many of his jokes (is, are) old.

Underline the verb in parentheses that best completes each sentence. Maria's glasses (contains, contain) bifocal lenses.

Underline the verb in parentheses that best completes each sentence. Several of the videos (is, are) on sale.