He ________this new computer since last week. It is birthday present.

A medicine may help with your illness, but it may make you , so you must be careful not to drive a car after taking such a medicine.

My mother _______________ my aunt called her.

________ have you been away from your hometown, Janet?——Since 5 years ago.

Look, your sister is playing the piano over there.－She ______ be my sister. She has gone to America.