Roy has to check ___________________ before phoning back.
举一反三
- –When will he be back? --- Not exactly. But it won’t be long _____ he comes back. A: before B: since C: until D: that
- He has to check the (spell)________ of a difficult word before he uses it.
- He has to check the (spell) ______ of a difficult word before he used it.
- The tour guide has to______ before the guests leave. A: check in B: sign the bill C: check the bill D: pay for the bill
- I must look ________ these bills and check them before I pay them. A: back B: into C: for D: through