I don’t know _____ or not he will come . _______ he comes , I will call you .
A. whether ; If B. whether ; Whether C. if ; If D. if ; Whether
The robot needs _______ once a month. And we will check it for you for free.
A. to check B. checked C. checking D. to checking
We didn’t know how to find them because they didn’t tell us _______.
A. which room did they live B. which room they lived in
C. which room they lived D. which room did they live in
In order _______ his English，he joined an English club.
A. improving B. to improve C. improves D. improve
Don’t make the students _______ this or that . They are busy.
A. to do B. do C. doing D. done
---It’s said that scientists are working hard to ________ a way to deal with H7N9 avian influenza(H7N9禽流感)
---Really? That’s great!
A. caught up with B. come up with C. agreed with D. compared with
