—How many times have you been to the Site of Zunyi Meeting? —In fact, it is the first time I ________here.

I could have offered you some help last weekend, but I _______ with my work at that time.

—What does the sign over there read?―“No person ______ smoke or carry a lighted cigarette，cigar or pipe in this area．”

The phone had been ringing for three minutes before it            .

The doctors have recommended that she _______ on, but she has not yet made up her mind.