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.

#56879

catch up with

keep up with

come up with

make up with

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Our government is taking action to improve the environment.

#54159

make…worse

make…better

make…different

make…the same

Lisa was supposed       her homework before nine o'clock. But she couldn't.

#54890

to finish

to finishing

finish

finishing

Where       your pen pal     ?

#59772

are, from

do, from

do, come

is, from

 —Why are you so happy  today? —Because I           to London with my parents tomorrow.

#56320

fly

am flying

have flown

flew

My brother____ born _____the morning of January 1st.

#61896

is, on

was, on

is, in

was, in

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