In some of the following sentences either could or was able could be used. In others only was/were able is possible. Fill the spaces and put to where necessary before the infinitives.
13 He was very strong; he . . . ski all day and dance all night.
14 The car plunged into the river. The driver . . . get out but the passengers were drowned.
15 I was a long way from the stage. I . . . see all right but I . . . hear very well. (2nd verb negative) 16 We . . . borrow umbrellas; so we didn't get wet.
17 . . . you walk or did they have to carry you?
18 I had no key so I . . . lock the door. (negative) 19 I knew the town so I . . . advise him where to go.
20 When the garage had repaired our car we . . . continue our journey.
21 At five years old he . . . read quite well.
22 When I arrived everyone was asleep. Fortunately I . . . wake my sister and she let me in.
23 The swimmer was very tired but he . . . reach the shore before he collapsed.
24 The police were suspicious at first but I . . . convince them that we were innocent.
Fill the spaces in the following sentences by inserting must or the present, future, or past form of have to.
1 She . . . leave home at eight every morning at present.
2 Notice in a picture gallery: Cameras, sticks and umbrellas . . . be left at the desk.
3 He sees very badly; he . . . wear glasses all the time.
4 1... do all the typing at my office.
5 You . . . read this book. It's really excellent.
6 The children . . . play in the streets till their mothers get home from work.
7 She felt ill and . . . leave early.
8 Mr Pitt . . . cook his own meals. His wife is away.
9 I hadn't enough money and I . . . pay by cheque.
10 I never remember his address; I always . . . look it up.
11 Employer: You . . . come to work in time.
12 If you go to a dentist with a private practice you . . . pay him quite a lot of money.
13 Father to small son: You . . . do what Mummy says.
14 My neighbour's child . . . practise the piano for three hours a day.
15 Doctor: I can't come now.
Caller: You . . . come; he's terribly ill.
16 English children . . . stay at school till the age of 16.
17 In my district there is no gas laid on. People . . . use electricity for everything.
18 Notice above petrol pump: All engines . . . be switched off.
19 Mother to daughter: You . . . come in earlier at night.
20 The shops here don't deliver. We . . . carry everything home ourselves.
21 The buses were all full; I . . . get a taxi.
22 Notice beside escalators: Dogs and push chairs . . . be carried.
23 'Au pair' girls usually . . . do quite a lot of housework.
24 Tell her that she . . . be here by six. I insist on it.
25 When a tyre is punctured the driver . . . change the wheel.
26 Park notice: All dogs . . . be kept on leads.
27 She . . . learn how to drive when her local railway station is closed.
28 Railway notice: Passengers . . . cross the line by the footbridge.
29 I got lost and . . . ask a policeman the way.
30 Farmers . . . get up early.
31 If you buy that television set you . . . buy a licence for it.
32 When I changed my job I . . . move to another flat.
33 Waiters . . . pay tax on the tips that they receive.
34 Father to son: I can't support you any longer; you . . . earn your own living from now on.
35 Railway notice: Passengers . . . be in possession of a ticket.
36 Whenever the dog wants to go out 1... get up and open the door.