I Chose the best answer to complete these sentences
1. ...................speak a foreign language is always useful when you go aboard
A.Be able to B.Being able to C.Can D.I can
2. I ..................touch my toes since I started drinking beer
A.can't B.am not able to C.couldn't D.haven't been able to
3. You must ...................... swim if you want to come on the boating holiday with us
A.can B.be able to C.to be able to D. will be able to
4. There was a fire in his office but he ...............escape through a wwindow
A.can B.could C. could to D. was able to
5. My grandfather was an excellent athlete.He...................run a mile in just over four minutes.
A.can B.could C.couldn't D. was able to
6.The doctor says he will never ....................play tennis again after his accident
A.Can B.Could C.be able to D. to be able to
7. I haven't .............concentrate recently at wwork.I don't know wwhat it is
A.can B.could C.can D. am able to
8. I live alone because I like ..................come and go as I please
A.I can B.to can C.being able D.to be able to
9.When I was younger I stay up..............all night and not get tired
A.Could B.was able to C.can D. am not able to
10. My son will never...................to play the piano
A.is able to B. able to C.could D.can
Bài này tớ làm xong ròi nhưng chưa chắc nên mong mọi người giúp nhé! 
1. B. Being able to
2. D. haven't bên able to
3. B. be able to
4. D. was able to
5. B. could
6. C. be able to
7. 2 đáp án giống nhau kìa. Hình như đáp án đúng là been able to
8. D. to be able to
9. B. was able to
10. đề gõ sai thì phải. Đáp án là be able to
Câu 8 lần lộn giữa D và C: xem đi: https://translate.google.com/?hl=vi#en/vi/being%20able%20come%20and%20go%20as%20I%20please%0Ato%20be%20able%20to%20come%20and%20go%20as%20I%20please
