A.tomorrow
B.important
C.mystery
D.however

A.frequently
B.gymnastic
C.adjective
D.difference

A.understand
B.engineer
C.Vietnamese
D.adventure

Generally speaking, proteins that come from animal sources are complete whereas those that come from another sources are incomplete proteins.
A.Generally speaking
B.animal sources
C.those that
D.another

In order for a doctor to practise medicine in any hosiptal, it must be provided that the doctor has the quantities to do so.
A.practise
B.that
C.quantities
D.so

Even on the most careful prepared trip, problems will sometimes happen.
A.even on
B.the
C.careful
D.sometimes

Experiments show that, for a bird, doing a bird nest is as instinctive as feeding.
A.doing
B.as
C.instinctive
D.feeding

I / look forward/ receive/ letter/ see/again
Love, Minh
A.I'm looking forward to receiving your letter and seeing again
B.I'm looking forward to receive your letter and seeing again
C.I looking forward to receiving your letter and seeing again
D.I'm looking forward to receive your letter and see again

A.food
B.school
C.tool
D.book

A.compose
B.emotion
C.symphony
D.concern