The world’s population is getting larger and larger, so scientists are trying to ______

The world’s population is getting larger and larger, so scientists are trying to _______ new ways to solve the food problem.

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catch up with

keep up with

come up with

make up with

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We students ______ our parents for food and clothes.

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depend on

live on

deal with

communicate with

Everyone is here. Let’s ________ our class now.

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begin

began

beginning

to begin

The Smiths are looking forward to ________ Kunming some day.

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visit

visiting

visited

to visit

 My little cousin enjoys ________ picture books before he goes to bed.

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to read

read

reads

reading

Are you good _____old people?

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for

with

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