Can / Can't

(a)   to work today because I'm sick. (I / go)

Excuse me, where (a)   a bus ticket? (I / buy)

(a)   me with my homework? (you / help)

(a)   but they can swim very well. (Penguins / fly)

(a)   he said that! He is a terrible person! (I / believe)

(a)   us tomorrow at three o'clock. We'll meet him in the library. (Henry / meet)

(a)   the time in a clock. He only understands digital watches. (My brother / tell)

(a)   that bird? That's a very rare species. (you / see)

(a)   the window for a bit? It's too hot outside. (you / open)

(a)   , but he can ride a bicycle. (My friend / drive)