Migratory patterns in birds ______ terms of seasonal changes.
A. in usually be explained B. can be explained usually in
C. can usually be explained in D. can be explained in usually

After the seventh month of pregnancy, ______ a good chance of survival.
A. there is a premature baby B. a premature baby has
C. does a premature baby have D. it has premature baby

Sumerians were the first to invent cuneiform, ______.
A. was s system of writing B. for a system of witting
C. a system of writing D. which a system of writing

It is ________ that so many young people leave school without qualifications.
A. to be regretted B. to be regrettable
C. to be regretful D. to regret

(After a party at Mary‟s house). Bill: ______
Mary: Thanks for your compliment. Good night!
A. You are a good cooker. Good night! B. You are a good cook. Good night!
C. Long time no see. Good night! D. Many happy returns. Good night!

Auroras are created when the sun‟s particles are caught in ______.
A. field the earth‟s magnetic B. the field magnetic earth
C. the earth‟s magnetic fields D. the magnetic field earth

Mach numbers describe the velocity of airplanes ______ over the speed of sound.
A. have moved B. move C. moving D. moved

Only if these conditions are fulfilled ______to the next stage.
A. can the application proceed B. the application can proceed
C. the application proceed D. do the application proceed

______, Edison didn‟t have much schooling and he was taught by his mother.
A. When was a boy B. A boy was when
C. Was a boy D. When a boy

Top fashion models often spend hundreds of pounds______.
A. getting straightened their teeth B. having got their teeth straightened
C. getting their teeth straightened D. straightening their teeth