Read these sentences and fill in the gaps with 'can', 'could', 'will be able to'.

1. I
show this element right now.

2. Dan
repair his computer, he knows it well.

3. We
talk about it for a long time.

16. how many souvenirs you have bought! 17. we have been shopping for two hours…i can’t walk any longer. 18. why do you look so tired? – i have been practising tennis. 19. how long have you been studying english? 20. what have you done with you it looks green! 21. the neva runs through saint-petersburg. 22. he can give you some good advice as he is very clever. 23. he got his diploma few years ago. 24. where is mike? -he has gone to the bank and will be back soon. 25. where is my clothes? it definitely was here. 26. there is great news for you today. you have won the first prize! 27. i usually go to the bed at about midnight. 28. how many spoons of sugar do you put in your tea? 29. we don’t have a lot of days off, working most of the time. 30. you must take these vitamins twice a day.