Choose the correct verb. Then use it in the correct form to complete the sentences.

1 Finding a cure for cancer still..............impossible, (stay, seem)
2 Avoiding illness is one thing;..............healthy is another, (sound, stay)
3 I ..............quite exhausted after the race but I was happy I’d won. (feel, keep)
4 I believe him; he ..............to be completely innocent of all charges, (look, appear)
5 She..............really worried when I phoned her this morning, (sound, turn)