After practicing for several months，I can swim much__now.

I hear Sam has gone to Qingdao for his holiday.— Oh, how nice! Do you know when he ?

What are you __________?-I’m preparing for my math test.[ ]

.After John stayed in shanghai for a couple of days, he got the impression _________the city was very fascinating.

Would you like _______ or shall we go by bus?— I prefer _______,but we have to take a taxi, for time is short.