A. to try B. try C. trying D. tries

A. an; an B. a; a C. an; a D. a; an

A. could B. must C. can’t D. may not

—They ________ in the pool.

A. are taking a walk B. are swiming

C. are swimming D. are playing basketball

【题目】A robot has lots of ________. It can help humans do hard and dangerous work.
A.courage
B.experiences
C.advantages
D.knowledge

【题目】We should keep the windows ________ in order to let the fresh air in.
A.open
B.opened
C.close
D.closed

A. shop；to do B. shopping；do C. shop；doing D. shopping；to do

—I'm thinking about going ________.

A. warm anywhere B. warm somewhere

C. anywhere warm D. somewhere warm

A. Are you reading; read

B. Do you read; read

C. Do you read; am reading

D. Are you reading; am reading

— Oh, no, it’s not healthy.

A. eat B. eats C. eating D. to eat