Choose the best answer to complete the following sentences.I ___ walk when I was less than a year old.
A.am able to
B.can
C.could
D.would be able to

Choose the best answer to complete the following sentences.Maybe the Smiths ____ build a new house next year.
A.are able to
B.could
C.will be able to
D.is able to

Choose the best answer to complete the following sentences.They ________ save three men from the sinking ship.
A.would
B.can
C.could
D.were able to

Choose the best answer to complete the following sentences.______ play professional tennis, you must be extremely fit.
A.Can
B.Could
C.
D.In order

Choose the best answer to complete the following sentences._______ you hear me clearly when I talked to you on the phone last night?
A.Were you able to
B.Were you able to
C.Are you able to
D.Can

Choose the best answer to complete the following sentences.Look at that sign! You ___ walk on the grass.
A.couldn't
B.can't
C.aren't able to
D.weren't able to

Choose the best answer to complete the following sentences.In the past pigeons _______ to carry messages.
A.were able to use
B.could be used
C.were able to be used
D.could use

Choose the best answer to complete the following sentences.Can you read this for me? I ________ see without my glasses.
A.can't
B.could
C.am not able to
D.can

Choose the best answer to complete the following sentences.If you told him your problem, he might ___ help you.
A.was able to
B.could
C.be able to
D.can

Choose the best answer to complete the following sentences.________, I always feel safe with you.
A.However fast you drive
B.However you drive fast
C.Whatever you drive fast
D.Whatever fast you drive