At the crossroads, you have to drive very ________ to avoid traffic accidents.

The museum was___opened this morning and some officials attended the opening ceremony(开幕式). 

My mother has not yet recovered from the illness, but she is __________ getting better.

—I thought he hated TV.—You are right, ______. he still watches the program.

 — It’s getting dark, but Mr. Chen is till at his office. — No surprise. Who else can _______ he does.