Complete the sentences with the right form of the verbs.

1. Nick couldn't get in because he ________ (to lose) his key.

2. Tom couldn't buy a pen because he ________ (spend) all his money.

3. Ben felt ill because he _________ (eat) much ice-cream.

4. Granny couldn't read the letter because she ________ (break) her glasses.

5. Jane couldn't go out because she ________ (not do) her homework.

6. Ted got a bad mark because he ________ (not learn) the poem.

7. Kate couldn't make the cake, because she ________ (not buy) flour.