Give the correct form of the verbs:
1.Isn't it about time you should....(have) a rest?You...(look) tired.You...(dig)the garden for about four hours now.
2.It is predicted that by 2050 people...(set) foot on Mars and...(already/start)...(get) ready...(colonize) the planet.
3.Tom regrets ...(not ask) his father for advice.If only he...(tell) him about everything,he...(know) how...(act) in that difficult situation.
4.Yesterday I...(put) these files on the desk in my office.However,they...(disappear) and I have no idea where...(look) for them.Someone must...(take) them by mistake.
5.It was about ten p.m when the scouts...(reach) their destination.They...(walk) for more than twelve hours.
6.You should...(avoid)...(walk) in high grass.In case you...(bite) by a snake,make a serum injection to yourself.
7.In 1978,the man...(charge) with fraud.He...(spend) four years in prison before he...(release) in 1982.
8.''Who...(lead) the conference tomorrow?''
''Mr Hanks,our department manager,...(agree)...(stand) in for Mr hewitt while he's on sick leave''
9.We...(have) the windows in the sitting room insulated recently but it...(keep)...(blow) cold from outside.
10.As soon as the pond...(clean) and...(fill) with fresh water,we...(put) goldfish in it.
11.Although no offical report...(issue) as yet,the American runner...(believe)...(win) the race by a hair's breadth.
12.No till lats week...(we/know) that our daughter-in-law was pregnant.Imagine our hapiness when we...(learn) we...(be) grandparents.
13.None of the miners..(manage)...(escape) before the wall of coal went down.Some of them...(still/look) for my special emergency units.
14.Provided that the rain...(ease) off soon,we...(take) advantage of the possobility...(climb) to the very top of the moutain.
15.It was kind of you...(let) us know about all the changes in the tax law.If we...(not know) about them we...(make) mistakes in our tax declarations.
