Rewrite the sentences using the -ing form.

1 It's good to swim.

2 It's difficult to drive a lorry.

3 It's important to laugh a lot.

4 It's interesting to study history.

Complete the second sentence so that it means the same as the first.

1 Alice sings very well. - Alice is good at_

2 I'd like to buy that phone. - I'm interested in_

3 I can't type very fast. - I'm slow at_

4 She may arrive late. - She's worried. - She's worried about_